Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a54b8d9b4849d45…

MALICIOUS

PDF

84.3 KB Created: 2021-09-05 20:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9d2358b70efb1116a1c2f4611a6eb85b SHA-1: 949408eba8b40b2a689bdeb7d203aff58feead15 SHA-256: 2a54b8d9b4849d4570db000fae9b510efb31e1593102be820848a678088b9047
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised websites, a common tactic for SEO manipulation or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ee603e78388---19467584696.pdf In PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/98735339014.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/toregiwibasetivixuwone.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c360655afd568149ed08fd5f6a86b089/17707339265.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/soloj.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/670pqmd0ik6361atr6vj4kh80q/pazakebekem.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/fa3lbtcl0tmokl1mbhivct9v51/26635181105.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/bubowasonirujotes.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/jokomemekuz.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/gipejirisebukujedodotol.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/42526589771.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/gosubogakusepufofibe.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/0fb91c69ed9df7af375e329202a29f3f/zodifagefukorakosikova.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/jadifodogiditedijoro.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744d1049080---guwaxazolexopovobi.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/nabijowefaparewonoju.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/vovuwumolapipawitudog.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/e0ebf04577f09576c8646f4375b397f7/linemobagur.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd925ce15de---37199726865.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160cae23e3de55---fukerevepajejafaweloma.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/mumumawaxim.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/wemidanigasagumibinebagas.pdfIn PDF document text
    • https://x-software.cz/data/file/gepugo.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e1da753d---fepoguzagorisivubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bizhub+c224e+brochure+pdfPDF 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_off0000e343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 10688 bytes
SHA-256: d110521d9e1fb62fc9128d600c817cfd1ab2006ebca0145bee3fc3c3e8c4d3a6
font_02_sfnt_off000113d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D4 18220 bytes
SHA-256: a24c3f98a575d21f67fc4fd0d01fc122506180ede3b8317f2adc3505572bc68d

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