Malicious PDF — malware analysis report

Static analysis result for SHA-256 6117f4524bcb8b81…

MALICIOUS

PDF

73.1 KB Created: 2021-09-01 22:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 63ce6c01c62791cca93d09c4320bcbbe SHA-1: f4226d4c36cd649bab3f62d55ce49849534b25da SHA-256: 6117f4524bcb8b815de06911fd2d246500c8ccd84b4d48b41e8691836ee1f982
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous external URIs pointing to compromised WordPress uploads and other disposable hosting. These links are likely intended to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://philabc.ru/uplcv?utm_term=deltoids+before+and+after PDF link annotation
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609902427f94a---lufotigojusebodoza.pdfIn PDF document text
    • https://digireg.dk/upload/zusobofimowotofenoveragi.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb239c852f---gugifufuvisa.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/tepuginomemexoxe.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/kaxunet.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/toxakuzagelusunukerosoj.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/nuwefubulok.pdfIn PDF document text
    • http://sushi-belovo.ru/files/nudiverubopiregawukigilod.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/2a6fb07a82a4a0582f7a65cf86583f4a/guzaxofedatog.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/99990005737.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/15957210549.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/j05on5ot7vbbi2aim61lf8ho96/94868524366.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2fe82f60242504ae0168c9da0f8890cc/21592996435.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ca69760d3---89556789748.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b45d476031f---47601959017.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/20692578332.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/440cdfb47d183b0caaa1d42536a2952e/zixunazaxelezate.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160784c52994a8---19561969098.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9b1578deb---41063204338.pdfIn PDF document text
    • http://zuche0551.com/upload/file/11921982555.pdfIn PDF document text
    • https://egca.fr/userfiles/file/wofagolupoxinaxe.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/giwiter.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_off0000bd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD08 10488 bytes
SHA-256: 27ffc69a30e8f71b6dd2b65764807d4e4543175c3b1ba69ffef2578a436076aa
font_01_sfnt_off0000d4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 16952 bytes
SHA-256: 7e6812082c1806532285b010df2d0fe9ad82eb5159031056cab24b8b3aab4079

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