Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ebf8f738375a88…

MALICIOUS

PDF

74.9 KB Created: 2021-09-02 02:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: be8776cea096db47fa9168dbed141c8f SHA-1: 914036b86a020a3df4328e770b1ec32b92420057 SHA-256: 79ebf8f738375a88d16e9bb99b602b3cdbfd5cb00fb5cfb29a50f0445f3f7467
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely serve to redirect users to malicious content or further stages of an attack, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6056

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 http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abfbf287a5---jojebabulaxofijiw.pdf In PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609090ce1528d---66002712790.pdfIn PDF document text
    • https://esvigo.com/upload/files/79224168782.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/84583710622.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/98870056393.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents//files/43809534114.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/riboz.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210616002053.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/67158887120.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/bcf1d916505292bdc4c52fdd0448730b/42434346537.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/48928629978.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c5d727eb718d0f4ac075c1e970a6978e/91793724933.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/t19armteie57mo0e2p6chog4m2/34581059482.pdfIn PDF document text
    • http://108homed.com/userfiles/files/11709202408.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/74jil8l2eauqo0146n5laf67sj/95063810349.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/zuzeroxi.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/22070618909.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/aee59df8f26c730d616ac514759096d8/sivikorixixupixabi.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/jnm02j44mgoiiaa8v34b36ovuj/84152812579.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1f3db271d5ff85d728284ad6478b1567/52589130939.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afa3210a7f1---851352427.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/0999516dd09a1a1be01a34ee3ab3d53a/23283767544.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/77129020361.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/zanaxilexesozoj.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/ed8bd354902b6d787dbf8de8d8ac5e69/nuwalajofobipenejaxabix.pdfIn PDF document text
    • https://strechybenesov.cz/content/vasuvesoduritit.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/aaor29ecjujvgvg6lh2nnao3g0/jesifozonijafamufubiwure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=city+of+heroes+warshade+guidePDF 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_off0000fd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD56 19232 bytes
SHA-256: ffb0d358bbdc846c1615c1b8c746bce80f5be64c2153be710f93691c7f2e041e