Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d27ff25eb5d8e7…

MALICIOUS

PDF

86.2 KB Created: 2021-08-27 16:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f7c93de3cb1695a218abbbeb1b98073 SHA-1: c806fa14d6ad62e8aa1897d953aa52610a04bca3 SHA-256: b9d27ff25eb5d8e7d64806822f6dc3eac6a190728fba5f309c3cac85a1ccebf6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of invoice and callback lures indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://soba05.org/wp-content/plugins/super-forms/uploads/php/files/ec50081bf28c0c68c5b3f9c4b0a00415/65963857151.pdf In PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/d00fd0d7f9779edac9bce4918c0dde01/21613217785.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/voxovutewakaso.pdfIn PDF document text
    • https://arabacioyunlar.com/calisma2/files/uploads/belumaridotipo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/dko4jh62d69cgi4tdqcvpb8upn/99064831049.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/159vr4ne0enq21afbemsvij9pk/buritibamadaxaf.pdfIn PDF document text
    • http://jljemc.com/upload/files/sonuladalo.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/4a84febdaf128e4cd2ddcf61539bbb56/19889167388.pdfIn PDF document text
    • http://jinohair.com/upload/files/fifidakemasiw.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/dinejup.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/77077210786.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/11391571197.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/828b753259bd5ffb7f4f534f8188934f/sokisafiwilubojuwo.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a0ad2fc5---fupitakuzeketuragajakux.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5d7072ede5ccae39a06d6edfebaaf069/25449278632.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/657e8225bf259866b8966fd7eb33181c/boxamerogaxozumaleb.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/35940245892.pdfIn PDF document text
    • http://nktrading.qa/file/files/43736214938.pdfIn PDF document text
    • http://short-story.ru/upload/file/lafez.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/49258667119.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160905915a2cbe---wapiji.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/72gaijeadlmc6vlaa9t9n7blek/xiluvowe.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8327817869125ace3db88c715b64ab03/nabopir.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad530e3d71---pemotokujasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=gentle+reminder+sms+to+boss+samplePDF 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_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 20060 bytes
SHA-256: 9953654d6374d56bfe623d6513282e644f7066c2497e82d7fe618c922a7710d5
font_01_sfnt_off000119c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C0 10732 bytes
SHA-256: 8e692bca0c05763548010e8896c248f2b3be32885cfb34a484ed11ca01d98b96
font_02_sfnt_off0001322c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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