Malicious PDF — malware analysis report

Static analysis result for SHA-256 765f6fc29c767f35…

MALICIOUS

PDF

83.6 KB Created: 2021-07-15 13:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8ba8a14afe2bf310baf2eeb47428c3c SHA-1: c6735ca69da3ea1c0a6afc33449520a9c5d7902b SHA-256: 765f6fc29c767f35150aede690be38d5b53aaff30cdcb524a3d7c308ba728736
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/11b4eb56618d6fd29876140cddbc1342/nojasuxifabitumiva.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a45ff4ab045---55882271509.pdf
    • https://bestofbucerias.com/upload/file/zokiwilem.pdf
    • http://kythuatviet.vn/uploads/userfiles/file/64279141680.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b6ddb4bc557343da3b0532dbbaa0cc94/9585254304.pdf
    • http://heibldr.hu/FCKfeltoltott/file/66605654069.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/p5cvh2kcsdkujv8pimvafpjp50/degilifusivoli.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c32a0186085---jidigesidofomax.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a480d84dc1d---48798162167.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8da0ed2d4---nuvifoja.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ebe45d316---61249009452.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5hefjdkg4bpvehm9brqt3oqqr3/23370576625.pdf
    • http://orderkai.com/uploads/files/poxexuwakijexezofelepu.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916dd55b39b---29904389070.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/8fjrij9h4h3klkb1t7vgori2lm/zegerelus.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af4bfae825---220788862.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b17f15d3---54124061536.pdf
    • http://allasclub.com/campannas/file/xolavebi.pdf
    • http://inhome360.ru/admin/ckfinder/userfiles/files/nutulazotinamepe.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ca97d12cf64de6c36960a3e568f53f68/vovekaxabaze.pdf
    • http://himalayakebab.com/shipinc/userfiles/files/sorokemiwupora.pdf
    • http://silesiacapital.eu/data/file/mofekozatomadokinoz.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8f2dde85f20e4bd177d0195b8c97bfac/zonanubegegugidos.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=madonna+of+the+carnation
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da51.bin
75e76a993518f336aca7372fd1fd71a918cf09d0831cac595fbed51517baf260
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 21636 bytes
font_01_sfnt_off0001101f.bin
8b521fad82cecb2d9705fcdb317317d713b3d2bd2d351852a3676f2a2ea0dbfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1101F 10352 bytes
font_02_sfnt_off00012761.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12761 16792 bytes