Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ee7d319a9b96124…

MALICIOUS

PDF

81.2 KB Created: 2021-07-13 21:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2d6c7ef539ae0a850514753d553e4185 SHA-1: 23b582d5227864a129441e46d7d27a227fc092d5 SHA-256: 7ee7d319a9b96124f5f1e0d2f153dfa411dc3dce94d33f02d04370e122f50581
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the final destination and leverage compromised infrastructure. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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
  • 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://coretry.ru/uplcv?utm_term=word+problem+about+arithmetic+sequence PDF link annotation
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/e28b234b70c576ad0b7d443c1795433a/18547181490.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/83976123383.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/bf9325b0d2b05cb83f22e808cb20283c/52832552098.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea20a861cd---rezosizozegi.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/xixebije.pdfIn PDF document text
    • https://carlojans.com/cms/file/solidasagosozizexujevijom.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/vovip.pdfIn PDF document text
    • http://strandedtattoo.net/file/vulegiwenar.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/vagumexisuzizos.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b77c32160f---60855777170.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/zigotimusax.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092ba7d22035---63728759643.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b225a10bf9---51857317885.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/j9ol8h25p8uiluakv3polm9216/26840660572.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/45ar1dr3re92hslq2719pn6j47/97647614096.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/ravogodajuvibokujufiki.pdfIn PDF document text
    • http://whitepurdeespires.com/clients/b/ba/ba703c466af5784ee38134b9d09df413/File/70171045431.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adba6c0cdbc---21655703246.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/nalixepiwatitavowefekuj.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/runurulobogatovajofikagen.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/lipisareb.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/zadopadibo.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/24640248244.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/bea6b138d6b16d8c4e6733c904ff525b/gowezave.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_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 18148 bytes
SHA-256: 1697d4413be01586a5e87150418750d7a7c673fac69f09e4e7771bdb2b127cd7
font_01_sfnt_off000105ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 11160 bytes
SHA-256: 31f00b11505f65e332ba14baae46b7788b0b4156debe22cd9004bd308d6c2b17
font_02_sfnt_off00011f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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