Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a7359d66c38f67…

MALICIOUS

PDF

95.0 KB Created: 2021-06-25 20:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: c194fc70d834096bdd6431b069a71e48 SHA-1: 38552acf40e53000be248ddf06c460f945295b11 SHA-256: 85a7359d66c38f679ae63120945d1146a79e50fbbd1174b156ecdce4fe6e9c34
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, consistent with callback phishing or tech-support scams. The numerous embedded URLs pointing to compromised CMS uploads and disposable hosting suggest a link farm designed to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://archism.ru/uplcv?utm_term=types+of+software+piracy PDF link annotation
    • http://shreejians.com/userfiles/file/togutabelujufekolikani.pdfIn PDF document text
    • http://ahchala.com/img/file/73156163633.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/zipafowiwanewi.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/waniworamuwavaj.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/b93c6295e9d2ce46f41d4869f5a52550/21332921843.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/8e1a011097ebddf06bb616b1d3805250/58678972999.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/75633663198.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/d984cd8b3d3ca42a9f2c8eddadfbc3ef/firikobevero.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/a415e9f3224fcc728260ee67d82db643/28535176869.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///74549493842.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d89486df0a296a915957303d2c35d4f/28625404294.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/20b778671d6de78f479a34068265d37a/sokinobenawu.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/1875ba7bab5a500588d2bafe54d770ca/vopufukerapobegamisarijab.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b663747ac---55471169468.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/90440327025.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608707942296a---60786418728.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b419e5376b7---lazibisovalawixekod.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/b35892ce73135506e1f0c6c894aa4a96/mepuwos.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/99514767064.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076df2276cb4---legivebawuzorukogemo.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/g1tltnb93jqnn4s1bed950fo29/96821774794.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/ef527aa3cac6e2899426c572051d0a58/mekefelujujutugenozopesu.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/22610955383.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1cf4bf998---tilalajajumobewovefal.pdfIn PDF document text
    • https://plasy.com/uploads/file/78812179764.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_off00011355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11355 16684 bytes
SHA-256: b272f7e05909531e390da8ec3abddbf409e795c3e71e5460d43ef6979806b7f5
font_01_sfnt_off00013edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000156f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156F3 10484 bytes
SHA-256: 265d5ba620e2c89276dc394db4f3eed4d4d889197466b26fb72107a36a447a06

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