Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d4f0abbbcb9ca8…

MALICIOUS

PDF

78.2 KB Created: 2021-09-20 10:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: baed3f95796b1729071716d94efd339d SHA-1: aaa338298fc723476626ddab8ffc2a048f0a88d7 SHA-256: 46d4f0abbbcb9ca85dd5ae1d86ed1948963040cd184cbb0e372f9526d2e5405f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's part of a phishing campaign. Although no executable scripts were extracted, the 'SE_CALLBACK_LURE' heuristic strongly suggests the document is designed to trick the user into making a phone call for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://smidgel.ru/uplcv?utm_term=cheats+for+house+designer+fix+and+flip PDF link annotation
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132736af39fa---92023301773.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/418b11545f3a4504cfa33baf45f05a8a/95596713793.pdfIn PDF document text
    • http://jump360.co/upload/files/20210903121114.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/darivuranofasimivoja.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210916_004746_8133.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132693abb1c8---mabev.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/pewuzoliborasovane.pdfIn PDF document text
    • http://myslizdrave.com/soubory/xotejidigasawifuler.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/vikulukevi.pdfIn PDF document text
    • https://kiptep.ru/file/94138372789.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/bupopowoxe.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/roxosapibe.pdfIn PDF document text
    • http://brenderup.ro/mm/file/98916239380.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/5275996048.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/baredinafekebosu.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/59524561710.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/bejukobivugiwiwujuf.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145e4310bf62---galiluzumo.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/87312990281.pdfIn PDF document text
    • http://3sdent.com/upload/files/xoxoserozewokugabadifomup.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/julupaginezaragov.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/94847871371.pdfIn PDF document text
    • 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_off0000ca5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5D 11008 bytes
SHA-256: 61438e45c24fb305e6206bc8b0242f9c0db58cf288a0abbf5a0a53d95e396333
font_01_sfnt_off0000e3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 18148 bytes
SHA-256: 5a11d5b80d9607d87aea880da6b88faf4c277bb6fafdc2d27330893a81ba8730

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