Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f38e386658f8bc…

MALICIOUS

PDF

75.8 KB Created: 2021-06-12 22:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d4c9b04a6527b7c3b79f5944448bba3 SHA-1: b77fd269ce9fc242becd5373d65c32ce143e0c29 SHA-256: a6f38e386658f8bceba5b7ab1bfa3b077909613d707230d24fc76619f9f213e1
156 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to compromised WordPress sites, suggesting it's part of a phishing campaign. The document body, though heavily obfuscated, contains text related to 'fat32 format application windows 10', likely a lure to trick users into downloading the malicious PDF. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

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 https://crysiq.ru/uplcv?utm_term=fat32+format+application+windows+10
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e772353c1b---diterijalumib.pdf
    • http://brenno-tojestto.pl/userfiles/file/72232823470.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/dbd7e85f61708683686e401afc1a132c/kojofimulijonumikivufi.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/hptkmrc5494doa9d3hj2kv8ol5/leravoxij.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/voevslccop7g3p2h2lbmibakaf/jepojebojuzutiwenolot.pdf
    • http://vipnjl.com/userfiles/files/sogexawivaxorapizedadu.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/5ff80b3273f0ff936d274627e282fa38/8619818719.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/b04de3716bfe0461137157ecadfceabd/ladifafodovisozemo.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/c5a5b00039119c0cfc08ec91ec4cb407/54496146514.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/t4satev3ovr28b4and4c223u35/11882855091.pdf
    • http://gleneaglehoa.org/images/file/19623096687.pdf
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mewojekofateludabosafuzum.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079a9536ef31---mexetuv.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/afc4c3b93cc13d7aaaa1362c744851a4/tutatow.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/0401a66268367773d56d2fe74f2e5255/xukofowixevobu.pdf
    • http://tamker.hu/userfiles/file/wuzatuzejo.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_off0000ea48.bin
03d62a5620b390a8f5c88eec7d805da82c4a25d8962be0421990fdcd4519eb28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 5840 bytes
font_01_sfnt_off0000fe2e.bin
a4778ff97964eaa6d24a532c9913ef9b68b9dbf07b5be3683c4e9bbfe2e03fea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2E 10576 bytes

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