Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a1a7301fa2b33f…

MALICIOUS

PDF

79.1 KB Created: 2021-09-07 19:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1749d20e6fb7a977ece43d70f16c88f0 SHA-1: 456f77a6518707c3d2aa6fc63f4df3a5ab85e1e2 SHA-256: 98a1a7301fa2b33f75b3fb273fc3f8901e6240ce9957c20c83bc5add3a28db1f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to URLs hosted on compromised WordPress sites, consistent with a phishing or callback scam. The document body was unreadable, but the presence of multiple external links and the 'SE_CALLBACK_LURE' heuristic suggest a social engineering attempt to trick the user into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/9fj1pr13fam2f96u182vo5b0cv/42365029031.pdf In PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e9913d941ee7b570f7d77d62a0d35789/36745867170.pdfIn PDF document text
    • http://grabnerestriche.at/woxudizumowa.pdfIn PDF document text
    • http://labotinnghia.com/img/files/pakiwoxatoxagabixuxitijej.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/91m8qvd8ojbaods7itv1561apa/89831811579.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92a5494ad6---45706992632.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/38269977683.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/24729973009.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/tazogebe.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/bapivivapojofipez.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/nogulemizonefokogagojovaf.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/5497044831.pdfIn PDF document text
    • http://kalikraft.com/images/file/vumekosuridekadidejokuzol.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2a19a4db---72764911608.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a34a50d9cd8---85316603723.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/da9a87608bd5ff9535ded81f3e3e29cc/70424824507.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608269e15a603---dulemetojemixugegi.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/39976429575.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/mdsfmc7nngmf0vdhir61k2ok65/51334099373.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854c7c307ca---vewefapevuvuzili.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/kadetamogaji.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/5g5thfl8tisjsp7b70ktuaf86q/3011953738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=rti+form+mp+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_off0000d1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C6 17944 bytes
SHA-256: c269b79169b3d3f6e693796fd5e8c969f1e0020e802b80bdcb03a376064a7998
font_02_sfnt_off000118d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D7 10092 bytes
SHA-256: 03bd3a64802fe915cb7b9827454a5e0c9684c37d14823d165990821d6e8ef465

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