Malicious PDF — malware analysis report

Static analysis result for SHA-256 4268995c6b428862…

MALICIOUS

PDF

84.5 KB Created: 2021-09-08 01:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 955cd86015d289214860a15e4a2fd73a SHA-1: f73f9beb1814d87760f0ce1233c8ae26384ad962 SHA-256: 4268995c6b428862493bcba6d9b4a586362601c07134939b2d5e2074a70bb18c
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external sites, many of which are hosted on compromised WordPress installations. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary purpose is to trick users into divulging sensitive recovery secrets or private keys. The embedded JavaScript likely facilitates the redirection or presentation of the phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bbe4ec5634c---puwitojopafomon.pdf In PDF document text
    • http://garmagostaran.com/Upload/file/27102181800.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18ea9558df---7896997260.pdfIn PDF document text
    • https://tusenfotingen.nu/anvandarbilder/108/files/8557343196.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/zagezida.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/28161908295.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/kewenu.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a5c262949---25335253444.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///73456254828.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160944800d6a12---gesubezafavezoxiwubiru.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160982b634f286---52218283126.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853435be179---98139184744.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabd1672b5c---65977755089.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/rrj6on48gbh4hjk3l3i4hcte1b/zowuguw.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b950c3b1e1fe40b0a1d4802478405565/xubelufagidusonitavisim.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdb6673ca3---waxifovesiwuzoka.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/013bd7155a1a11d2acd6dc28ad604aa2/93015276555.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/zasetegilajet.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ff0e66d0a0d---xosox.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/33344618881.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/99958176156.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/j0104t3u5av41peoqst4sfukdv/laxizizefetewazifekof.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/51022088378.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eb78a6dc7---guvaza.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/37799283179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+tutorial+photoshop+cs4+pdfPDF 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_off0000e430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC42 18212 bytes
SHA-256: 4ad3d374a14c209a495d143a7ccd99ce1c3d573b19b52c690787682e3d319324
font_02_sfnt_off00012af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF6 10848 bytes
SHA-256: 57c66e997711d5b09c8329a1743d9aef8f1bc7c4b55a16f60b2efeaafb341caa

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