Malicious PDF — malware analysis report

Static analysis result for SHA-256 093f3b7fee26f125…

MALICIOUS

PDF

102.4 KB Created: 2021-06-28 09:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2db7eb39601271d7d2710ac035e8d6aa SHA-1: 12cc0f198a8f529efa488389dfe3b1b248385823 SHA-256: 093f3b7fee26f125f3cd6c78410e350142b29f3aa9adc26beac58984bbef6640
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/65380bb5ef0785ba9fdb835cdbc60de6/29064552066.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913672cff91---zuvala.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/hklggriimo5agvkse36j6c3as6/fevepusufozibadiwex.pdf
    • https://netwindowvn.com/uploads/userfiles/file/21886889579.pdf
    • http://princeverma.in/uploads/files/nejerub.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f967336e9f---65631126966.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710299a53d2---77552306444.pdf
    • https://alexandrapanayotou.com/web/images/static/file/kiwikunab.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/peq7basi9t41leomd9v5i3bc0j/sokogizafamakuduxagiw.pdf
    • https://grandegroup.net/files/60916292789.pdf
    • https://koncnc.com/genelresimler/file/vadulojibiz.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/9efrhrgl1o729v2ra32sms7ar8/99752556030.pdf
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/vuduzater.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609451261b20a---45648632416.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a35bb1c8a---40948659194.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/hdup3rvdm1tvk5nd6t91pt8e44/kelobilafesavorafozipusob.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/rejbqnsu1b06lkoq609mqlj4j7/sivuxedifigewizerumiguw.pdf
    • https://ascinfratech.com/clientprojects/trading/file/1778622418.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/mupusexenijadijuxugil.pdf
    • https://angkagenap.com/contents//files/sogofowes.pdf
    • http://dtcguild.org/clients/80367/File/fegasomujizi.pdf
    • http://munsusa.org/userfiles/file/20210610162044.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090296e96db1---61489619665.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=christmas+coloring+clipart
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f72.bin
561c0e0d01563686419c87074c34d94b5c40278675c208ff6dfb7675cf00e4d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F72 16984 bytes
font_01_sfnt_off00015bba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15BBA 16792 bytes
font_02_sfnt_off000173d1.bin
1bb2b3a57867462dfdb84e34d5fa4aeed9fba1180062c2bc5dc6d227247f61d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x173D1 10720 bytes