Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a53d2df27e1f16…

MALICIOUS

PDF

66.4 KB Created: 2021-09-21 05:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb84bfab5baad036046e44a891226de9 SHA-1: 5d077a621f7c3d5d02b52ca28a0de30dccf4d0d3 SHA-256: 25a53d2df27e1f16b2de73964ff469bf766454b4a5d5025ad2a7380c9ef71d0f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to numerous disposable domains, a common technique for phishing or distributing malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination through multiple redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8178

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=es+file+explorer+32+bit PDF link annotation
    • http://www.mariabeckmann.com/fotos/uploads/files/34705789813.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/vovidujexuzekutajej.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/paxibanopepotodugoji.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363ce46f8f4---62184730507.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/38843726355.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/liruwitabipo.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/gotexebumo.pdfIn PDF document text
    • http://talesma.com/E/file/59405695302.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/rfrg5ioc1gsrqasr335l0558o5/gasimutegamilifakixi.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/lofalarogeta.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/22339397300.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/62284858285.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/vezenowetupa.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/53425492993.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/runosaximarazede.pdfIn PDF document text
    • http://techmechengineers.com/uploads/kixesemenowobejifix.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/bce526eeec90560d1e2f851079638831/zojokaxir.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 10604 bytes
SHA-256: 6615c94e891fee0b4199931f5ebe51f042b533fdf6802bb2e5d67968ab27dfa4

Open this report in the interactive analyzer, or submit your own file for analysis.