Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb3d7e53cf1b35b…

MALICIOUS

PDF

68.3 KB Created: 2021-05-29 07:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 461d442d9183150cbd627cea65ff01f7 SHA-1: 92e8c9142480bb3d56b4e887107e2212899f0cbf SHA-256: 6bb3d7e53cf1b35b284c26fa5756fc54cb8611febea7ae3fe3522937c9e4e7dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://beastyenergy.com/userfiles/file/roverugeva.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/a84fb605e28f976be908ad2a0a6016c8/wuwevibedi.pdf
    • http://mazdooradda.com/userfiles/file/74525943382.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae080daa804---xezasufoxiloku.pdf
    • http://afghansolar.com/userfiles/file/gajovosal.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fef58ab88a---jiwumiwijisipobazamajux.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9253c653711c9a3b9bcab734b9f4b74b/43461470244.pdf
    • http://bartuceviri.com/userfiles/file/lufezirupokag.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/98c28844dfb9d8005c4b576eba3e2d4b/renanojigukuk.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/44bd3b7746e261548061e281f5ce2e2b/gokifozubukidegodazafura.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091554556029---jarobena.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160905a6a5d0e5---pabugovi.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160768ff52404b---55814651347.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088e6e1cbee9---wubukiferu.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b145e20ed2d---33918088816.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=limitations+of+beer+lambert+law+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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd8d.bin
d10f485d591066f6007f8d1f62f9c32ec4cdd8334499fcb7cb1eb027da292369		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8D 5360 bytes
font_01_sfnt_off0000dfbb.bin
62598428cc73fe8593c0e99cd903cee614daec0eb695354b83678c93f0abf3f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 10596 bytes

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