Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd4fff929210fba…

MALICIOUS

PDF

81.7 KB Created: 2021-06-15 21:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 775eb65f78ec37d58cfe98303134bb62 SHA-1: 996bb21df70db85fb35e212cf9a8bb89fc198a40 SHA-256: 8bd4fff929210fba6adde39e962116764db188d0b30b8b66b50f4e024d59491b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to song downloads, likely a lure to entice users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crewmak.ru/uplcv?utm_term=hum+tere+bin+reh+nahi+sakte+dj+song+download PDF link annotation
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/71e008d34d43b1bc926da51b032e2f28/91610856128.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/votamixovixa.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/90895766771.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc3a2b83e5---58093051446.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/be295e3f49167d6cbe27cc254c1dae01/fovezorad.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/towidapelak.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608910adb646c---dopekiriwipon.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/tevejabamekomapu.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/71984309087.pdfIn PDF document text
    • http://fluidearthconcrete.com/userfiles/file/mugadunitewetinan.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/694e44a0ae387dbda5b0d94ad507bda4/fikoluregukojunonada.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/43b4adcc10276d511e06c1344ced43b1/61384575227.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/kosubalubizoluf.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/9423644649.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/83a15c4573ed1c95c944f3f7a7fafb9f/32025867484.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce6df0f7e7---7731419584.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/b414aa0554d065e9323e39bd690cc051/27408675242.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BB 5572 bytes
SHA-256: ecbf1eef7733bdd99da366a71ff679518bf3500bfac8a9234695f9469bbe3618
font_01_sfnt_off0000e48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48C 10664 bytes
SHA-256: 67caf7e51abb1705b6d66d10e8edaaff8d1ac4dded35732b81dcbe02aac5a866
font_02_sfnt_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 18776 bytes
SHA-256: 1df41416ece054d3cca32f135e48dc95f4d9c8a2bff4ba4edba1d14e21aabef6
font_03_sfnt_off00012700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12700 4020 bytes
SHA-256: 03fa2be299eaf56bbd61ab8b3a14daf17d3192478614f48d2865d8a62d5634a6

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