Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4ecfb16a108529…

MALICIOUS

PDF

71.9 KB Created: 2021-06-11 04:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd86ce20c87f87f75ce21f777380cf81 SHA-1: a7d1505b3ccf313f0bfddd90ae652bc3932a9282 SHA-256: 2c4ecfb16a10852961965fc569db35bddd895ec18752027c1ccc0d731a0f2497
156 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised WordPress upload storage locations, likely to host or distribute further malicious content. The presence of external URIs and link farms suggests an attempt to trick users into downloading unwanted files under the guise of legitimate search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://oniceh.ru/uplcv?utm_term=transformers+4+dual+audio+720p+download
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7a2b8f28---xorovozunikamulepa.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608256c8397c4---pafirewowegunes.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160878d1250a9d---26484606285.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8eab54a9d---gidikobuximugepilepaso.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/7f66c696e6a541a057f6384447fab7a0/jumozepusixuf.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/b0cf3f4aec6754fbacc07352d4b6330b/diruzupifipopojurudikenu.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810f51d7c5c---35006027129.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef4240eeea---wadobopewexafivinorij.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608e86fe21b4e---vuxiwesolisuzirogap.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db14055d04---70950715886.pdf
    • http://aclamerica.com/customers/CMS-IMAGES/file/93936570107.pdf
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/zutegabumovanedulosude.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9ac0f79904ac9e9df95d5d6c873f11df/gonasetux.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160905a3127894---lorozegivo.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/0989ba8a63c3b6b20606b546b3d83fea/69112640175.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000dabf.bin
bafe9331dc1a6fd3608667b5b428f2800b67f7ba42297827e1f41c1df37fe20b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDABF 5668 bytes
font_01_sfnt_off0000ee0e.bin
18cfe85666925aeb9355f3f5be72d228f010bc930b198b62c17bc8b99ea956fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0E 10864 bytes

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