Malicious PDF — malware analysis report

Static analysis result for SHA-256 d06c336e917096b3…

MALICIOUS

PDF

90.5 KB Created: 2021-08-08 15:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: f95fa0c41d85219198f23ce362423824 SHA-1: 06aab0166dbd23266174f7a72bb6e7b1813b5729 SHA-256: d06c336e917096b3cd221c62fe34b69bc65d86f4c3024166dd304c96d18a9d4b
276 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits multiple high-severity heuristics indicating malicious intent, including MFA/one-time-code harvesting and payment redirection lures. The document links to numerous URLs hosted on compromised CMS platforms, suggesting a phishing campaign. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a315d03be98---85598720348.pdf In PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/pedatimati.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/9qshj7l6iikh3itnmp7bc7fm5b/49807794060.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/wuvirut.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/b7q8i3903skuub84st2n5qutua/65134649124.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/psle9k8de2s4jc4gh3uvp6bfht/fizibumub.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/a0fcb57b7f0bd5f339015c142c14ca3b/70397111627.pdfIn PDF document text
    • http://axwelindia.com/uploads/niwuvamivebol.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d03d614e125---dunogujej.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f88073f4e---71031154445.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607952ec180d3---bitigegofozipunab.pdfIn PDF document text
    • https://ckmandarin.com/uploads/84748223408.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/c6ov37ghs9v3ckkdvnh30lacc5/82366962196.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/91027369564.pdfIn PDF document text
    • http://accronline.com/userfiles/file/65996587515.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35f999a985---buwigibebuwizasiveba.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/47799312770.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4e5effb0db737037c8c456a5733c3e1d/39231265671.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608529894f678---bosebivizemerevesefimo.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/94021624079.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/jfj8dtqauro5tjb4j7h213s7m1/zobovagob.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/u4n0p45rp4hg695l7nqr1t13et/negosizof.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/58844733083.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf94b041ebb---nokemigomefoves.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ec289ca67---vomudekadineroboxuwu.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/f1b3b4d095e4650d759bd248309e2515/75749649477.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/fne8qj06t6a988d5icdtularq9/tinomefujem.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/gjh29bp18feua6v86prtko6662/sugujobeguzefavopasefet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=final+fantasy+14+free+trial+asking+for+registration+codePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF765 18664 bytes
SHA-256: 63044923d0017066163484014af425aad9ba6d33602040b98e6f09c9e07debbe
font_01_sfnt_off000127b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC8 10964 bytes
SHA-256: 257b5e387ca4659d54c4b010a0c49141efdebc9bde019d8d7c0a351d61acf0c8

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