Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5a4993582757f4…

MALICIOUS

PDF

94.8 KB Created: 2021-06-26 02:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3c9c864feeb7afa1e930d1e11b02378 SHA-1: ef7a38cec890291af1c315b12da7f7edb75eae70 SHA-256: 5e5a4993582757f49d36e2cc7a556e06d247a4720e154d0699742906bbe6512e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute traffic to potentially malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings suggest a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/beb7080daf37fc09c17934f744176da5/ragutevedojap.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/7772a606d06539e2083b0b1121b549e4/366161965.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/04847f2f0aea7c278daed3542b86927a/91211483087.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/19676569184.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/e046fe33f440fc187a37322d41f3f4f5/mevoju.pdf
    • http://ldbell1965.net/clients/85689/File/73513292254.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/qa04dljqkm4g14ahqapcnckma7/dovojegezaw.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16082523889b62---jizusuxisilibikokubami.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/62e77596271369940c7f20ca463ed7a1/xovitibo.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc84b3bc79---vajisikujowonibineji.pdf
    • http://exosportsante.fr/ckfinder/userfiles/files/38230161790.pdf
    • http://ritadas.in/userfiles/file/javaxo.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160718f5b837be---78965747160.pdf
    • http://etcad.net/np/upfile/file/66282631183.pdf
    • https://aprilboya.com/userfiles/file/15820605920.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/7e971595f456c04d5fda3b8ec2fc6a45/10123151698.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/e80ba0de6e25df92c806b323057212b1/subakiveri.pdf
    • http://myblindz.com/fck_user_files/file/pewizoxixin.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/dotaz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985b59196b5---67731080731.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/bec55c923bef9337d04c9634d08faeb5/lelofot.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/085dfc586d0d9eaa0158a76164a2db31/lulazepenitepitigunukive.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/f301a71517a303bd9e8cb4482306b76d/87687166135.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608551e33f46a---folujewe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=refractive+index+of+glass+block+experiment+pdf
    • https://mediaget.com/userfiles/files/lefasivozazibugukufelux.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 16792 bytes
font_01_sfnt_off00010cc9.bin
de90c80ff97104fc716efe3cfdd29756f49620c49152a27363a3df9b7724c95a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC9 17056 bytes
font_02_sfnt_off0001398c.bin
d0da8c7c324e727df3ada470284189f92c3b9464fff850de568ea06cd2a727b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1398C 11408 bytes
font_03_sfnt_off00015410.bin
885b9024a80bd539ee88f4c17c1e1fa3cc6dab475ff5b740ebf17c73a317c9ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x15410 17112 bytes