Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e6f4a84167b69a1…

MALICIOUS

PDF

89.0 KB Created: 2021-07-24 10:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7435cf5a48919d520451a2e6da055cb2 SHA-1: 4ad6299b044b149b70967395f8672c35f796ae22 SHA-256: 0e6f4a84167b69a1b9ac1f9cbba74e345e03ffc8a62fa0b1bcbd5e1a3fea7540
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the heuristic findings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://almoheetmanpower.com/public_html/userfiles/file/jukuwoxu.pdf
    • http://splogservice.ru/content/file/buromorixaxenik.pdf
    • http://specimport.by/files/files/sokigapigukazijo.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/lvl4dnnh6rsq680sge1dsfaola/renasepezinut.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/83298a8607becc8a6f290b667fdfa7da/57887546626.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae33aebde8---27561678085.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/659emsv6fra0ugnb30cija8ap5/powefidapozokivinudop.pdf
    • http://spy-military-labs.com/userfiles/file/21218950746.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/kaxowevafomila.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608386a0af2e3---75477925330.pdf
    • http://scbczy.cn/up_files/file/20210627_072905.pdf
    • http://coinmarketsuite.com/ckfinder/userfiles/files/vonenediperorefi.pdf
    • http://usmleworkout.com/files/file/zolizebiwarug.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ad965bc8a04---kanatufubupaxevopurino.pdf
    • http://www.themixchange.com/userfiles/files/5500785220.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/09dc3bf77a834118eb96ba60f6d14f77/budadibefilujifadigifi.pdf
    • http://efuturesthai.com/uploads/files/83830213901.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab34d0b540b---19466285531.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=can+you+make+rice+pudding+with+evaporated+milk
    • 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_off0000f1b2.bin
4f266a08b4a164cd3a905d1a0143b70037864762c871edfa1d49a0556104d70b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 18240 bytes
font_01_sfnt_off0001217f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1217F 16792 bytes
font_02_sfnt_off00013996.bin
f608f096dfc1ecfcba0f65c3b52a305abb33aff24017aafb89b85d6bb12f5887
pdf-font-stream PDF embedded font (sfnt) at offset 0x13996 11284 bytes