Malicious PDF — malware analysis report

Static analysis result for SHA-256 8978fb386b15bf85…

MALICIOUS

PDF

64.3 KB Created: 2021-06-02 19:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83b6d25d2484844f57c3d6c24b3d01ef SHA-1: 56966d46dae7d22796933a8985c335c6799618af SHA-256: 8978fb386b15bf855a1c62dcbae672ddc19fe1dc1258f86fb2c7d5b39a5de717
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8428

Heuristics 5

  • 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 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
  • 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://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b81c6ef49---tokadekuxipolilorozewo.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d62d2a7722---bexumaruvusida.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/o3cdsu3bmprjjedkshmervv865/82919842837.pdf
    • https://zlatartopalovic.rs//files/71962630737.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebc9ad0142---3969837158.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608850149108b---11127951589.pdf
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/005ca64737cb30d8f152758ecd004a0c/35300513873.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae64b17cc0---sagesodu.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ik289co5nacf66d19j2c0n5977/60273999236.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/b0d4cdaf54c97917bf8e7393fb08a756/jonumifotenavupixevino.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/630234438d27cff97ab32f5174dcb481/duriwurogerak.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/df530076580bab4434b0ad1e3e4bc811/pupojijakawozetedixi.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8186ad0cb---fupalupekejulejifalunak.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/365a75538e63a3e6c069a230fc9d5ff8/56378813999.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/9tghnj6fvs39ao8fk43houta3k/20357617915.pdf
    • https://akapacha.com/userfiles/file/76957838499.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1f0f217d43402160db255f029add0f3f/9091189458.pdf
    • https://alakharia.com/public_html/userfiles/file/55198521341.pdf
    • https://luyenthitoeic.info/userfiles/file/96796674187.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/874507bb093f7570795492f2663d0287/femuluforuzibetenefe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+stop+loud+bass+cars
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e607.bin
7f1ff86e14db14a7ef399d6678c202f2c717ade290fa48339fb6cdd027a9a4d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE607 5260 bytes

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