Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f49eca088b86af3…

MALICIOUS

PDF

86.9 KB Created: 2021-09-05 06:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 064686d4149d7b1730b755e1127bb177 SHA-1: d4353681f115f000989c88a0574db5cd67572449 SHA-256: 6f49eca088b86af331d209079c48170a091e7075389cb92c4824422ecdf4fb3c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers. It contains numerous links, many pointing to compromised WordPress sites, which likely serve as a link farm to download a second-stage payload. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7946

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://expresskaliski.info/file/76811828926.pdf In PDF document text
    • http://www.ufolep-69.com/contenus/files/zavesivugikurukexo.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/gttj95sbviqs808fhd9m92ekiq/webigujifamigawisozod.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b22eb66a0---96291614640.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/kipevoxukiwexijogob.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608155337fcf5---zaboboketilibotutem.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/cb6f10a36ea7b2f415a4a3342ab00d7c/vamof.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add2ef52e8c---16083428804.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/79908241559.pdfIn PDF document text
    • http://centronegozi.com/public/1767469822.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/0rmlv2phehp691fg7j4iend8l7/sixada.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/jozumopumonozibigibar.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/kovodajewibumibi.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/56200775767.pdfIn PDF document text
    • http://safarang.com/basefile/files/31450307025.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/bevekisoramolojuturis.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b363449d6fc---24887617110.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/1bf3813fe7791a1a9421d561870b6ab7/dozumusevawofodemevexog.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210626_7BA6CDE330604636.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/28a245977338263c5275c7849ca08a76/64231923883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=column+multiplication+worksheets+ks2PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A1 19320 bytes
SHA-256: b61381c5faa4e9e3c3eec8b71228122742434ea5b5b834ccb622a92855d85587

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