Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d24d6b742c1b599…

MALICIOUS

PDF

76.3 KB Created: 2021-09-06 15:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9cf4148ac83b90b946efb11c3ccf4fdf SHA-1: 4a70ddd998a89b19c2d6fbe88f0661eaa240e38b SHA-256: 0d24d6b742c1b599d35cbe68445b807544701025a4de2d7c344795492d359b4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised CMS platforms. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.winsum.frl/ckfinder/userfiles/files/korub.pdf In PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/nojazewutebawifikegufo.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2fktf6q38vjif9ij6po7ea81m4/netixakadawovudoro.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/lepipivofugevupix.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/weketolikozodosewudej.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c3454134c---barobikabejegi.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/e7d90d8c25b9036d5afb84c1fff17c42/magumabatelavevuzimena.pdfIn PDF document text
    • http://secoinblock.com/upload/files/ragipafedos.pdfIn PDF document text
    • http://ccmyungsung.net/userData/board/file/3402173919.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/90853339833.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ea8ec04c731a810f864d52816811ae56/88008742454.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/f2d2e58f479781088a32811255cb305a/30553452771.pdfIn PDF document text
    • http://bdsductri.com/upload/files/7711304379.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/57395843740.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/bivuvewaz.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/pabaji.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/81446605528.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/h8rd38a9iqj3i4hamm5u3jmn2c/sefoxajutamamapuvob.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/suzajur.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/f1dqsp3eo218kuqeqovbefttg1/wigamupu.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd0e42c173---tituwikulafufakuzubu.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/51665116369.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/xenepu.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/wajexigavib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=graphic+design+portfolio+pdf+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE050 16620 bytes
SHA-256: 304b67cafe54acb6b3b8cec7b310b8eea7dc9c47b0afc843e459ed58e187d98e
font_02_sfnt_off00010a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A68 11024 bytes
SHA-256: b5305c3da53348848b1ac7b54b6576a17ba357312755e161a47c72fc1737fd71

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