Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8281561bba91db…

MALICIOUS

PDF

124.6 KB Created: 2021-07-13 14:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 033756821f517eca90811b25549f04c1 SHA-1: 7ccf64c054417189217605476ebfba304163c3d8 SHA-256: fe8281561bba91dbca5691cb6bfc72a6cbb9d3a7eefb7c0ec8724bf6247fdfe4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits multiple indicators of malicious activity, including being flagged by a machine learning classifier and ClamAV with a 'Pdf.Phishing.Trojan' signature. The heuristics indicate it functions as a link farm, pointing to various compromised WordPress sites and disposable hosting, likely to obscure the true destination. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document is designed to trick the user into initiating a phone call, a common tactic in tech-support scams and callback phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 7

  • 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.
  • 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://wastran.ru/uplcv?utm_term=net+exam+is+for+what+purpose PDF link annotation
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/629f3fc88d99562dfec0dc0bce659739/mifetaliwilakefu.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/67216216379.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ktgb7ucbo7u3dlu0p0r08fin92/wunusolatoruwapo.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923659aad19---35590332939.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/15692087623.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/78240858656.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/wigosiwile.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/malapat.pdfIn PDF document text
    • https://tonitomov.com/picture/file/sovixim.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9b51c27d9---fotewuvukelanogegex.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/90168074343.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/jivazat.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/65d5abf9f08b2cc5e0e4e4f83558f94c/52603750054.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/999f3929bb58e728e8be37559a5e2157/xufotamovikerat.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3fd6c68d87---57356832747.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k53m2emm6vtskg4l3uqamboob2/65183545922.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/nirifitoxeza.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/zexerogabituso.pdfIn PDF document text
    • https://andrejc.si/files/file/92399847490.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/lixowaneg.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fadd149eb---63232749514.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6912c8a46b---lasewotarimoxozefotowubaj.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/i3v52ttjvcivnqfam3o2vvspg6/43572056810.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/jipizu.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/kuratuwokubotakapi.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_off0001853b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1853B 17784 bytes
SHA-256: bd6fc56079d1284ffd5e7acfa5ba1ff2b051f1039509b5add409df5dc1224669
font_01_sfnt_off0001b436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001cc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC4D 10736 bytes
SHA-256: de31b748c2514c79766aaff5584643c4b0ee4085f486a0c69e3891d60a2f6d62

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