Malicious PDF — malware analysis report

Static analysis result for SHA-256 8075f1c7e2e0915a…

MALICIOUS

PDF

77.5 KB Created: 2021-09-07 13:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ecbbdcfd4b23eb9d6c002b6594812f34 SHA-1: 7d5875940527df29e818aa174fa61f52afc49691 SHA-256: 8075f1c7e2e0915a06e7212dc56c72976dc24caf23f2c98ed102c196a8bc5581
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/n1q1jp5041t439v0u5krmguak1/62303532502.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a9b68b82---nevasasagalolubizu.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/5caa65e1b7b84bea60fa90503cbe5bb5/41408819462.pdf
    • http://educaholistica.com/resources/img/imagesck/files/dirale.pdf
    • http://thefarmatarapahoecounty.com/userimages/fuwotitinonugetowegelod.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/nogezanavep.pdf
    • https://betalinktech.com/blmedia/file/xorozupuv.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce00924243---29746722905.pdf
    • https://rumusjitu.com/contents//files/96936159045.pdf
    • https://xeroxexpres.cz/userfiles/file/77236066509.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161080a13df250---79395488186.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/ijjsbq8can1ro3eq3dbd385dk2/24166162928.pdf
    • http://heureka-cz.eu/files/54844338718.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d021a1f583---rufarabobelabuzaxanisifup.pdf
    • https://medius.sk/userfiles/file/fuziwodat.pdf
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/40744420177.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de5b7165544---90422577078.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/902d6bed336aedd2b9cda6ce19091c6e/72810747462.pdf
    • http://bigredclassof1960.com/clients/879476/File/riduvopamatenevevuwiw.pdf
    • http://calliopegoodrich.com/clients/73417/File/wolizin.pdf
    • https://lifecareproduct.in/ckfinder/userfiles/files/voranabozevil.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=basic+principle+of+mass+spectrometry+pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e160ede5f---nigatajukudamot.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca1d.bin
0b2b438e43ec1333db13f21c08d9ca0a1efef0a9a90fd897fd004ceb1bddf5c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1D 10948 bytes
font_01_sfnt_off0000e38a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE38A 16792 bytes
font_02_sfnt_off0000fb9c.bin
bfe1fdbb562b5f9b6ef4aef42bb793475cfecde78407a0044df7292b6bbd635c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 17220 bytes