Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb9f74088a620d4…

MALICIOUS

PDF

79.9 KB Created: 2021-06-28 17:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11bfd8eccf480aac36a25fe3ddc120ac SHA-1: 0e4e4e7580a17da972bc58e8d6f613e83e5fc1c2 SHA-256: 0bb9f74088a620d492bf9a3fce52e683a2ba6499645fbbe9e7cded03e2901907
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/ebc35fdc77d17650ae142d15633156a2/85793727347.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6342388b4---46990091280.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a518f0568---damesa.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/765316557e66e5e4a07f58e03d15940a/71483142047.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/1p14vb3sbj4kf8rp2eiij0r0ur/27471064139.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/85c439098443d1cebf190cb15b4e5fbb/91611445515.pdf
    • https://blindnow.com/userfiles/file/luzudulazivasejit.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1fc7a26ce---36538883775.pdf
    • https://lotteppta.com/beta/assets/file/pelikijidu.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/86544544069.pdf
    • http://championshipsportsrings.com/clients/23492/File/fifij.pdf
    • https://ratsimae.ee/media/contents/file/naxudolozanoxulumupa.pdf
    • https://tonitomov.com/picture/file/82725319425.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16092bd722bf44---67407518113.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/7gjjar08jmvtuind5asdh091v7/wurujefebupojerera.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609858d60f799---94219870656.pdf
    • http://hutergroup.de/userfiles/file/jofalezesedomizelebolime.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1386263f917dcfb5fdcf56b7e4d3a909/mesorejezipafevuvupiz.pdf
    • http://grandp.ru/userfiles/file/76897637890.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4277e9e8b---56507293089.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b14030c21---wusuzolizinusewe.pdf
    • http://enjoy.sk/editor_uploads/system/files/6131271959.pdf
    • http://trendymamy.pl/userfiles/file/28645250316.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2bafcb304e4f38f5d74ddba55a54eec6/dawunixugasote.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=convert+scanned+pdf+file+to+editable+word+file
    • 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_off0000d4d2.bin
d33b46d54e72641cb9b2aa0e24af00f82fe944e6b728fe9aa9cde3fb844cac03
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D2 10936 bytes
font_01_sfnt_off0000ee2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2C 16792 bytes
font_02_sfnt_off0001063e.bin
6a28a57ad42a970ce299d5b4c150fd9453dd920947cd712aae53022d59cc8dd5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1063E 16924 bytes