Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34c4e4db42cf28b…

MALICIOUS

PDF

91.1 KB Created: 2021-06-28 12:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ba7bb496f0b4e43f5c8c714acc81076d SHA-1: 4c85e7bb400f2a180311f74c0e8dab5307c7c462 SHA-256: c34c4e4db42cf28b22b42ef4e2a467adfde776baf9a9c2cf9ff8cfd3f0328087
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6853

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://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607d93865e866---44774207971.pdf In PDF document text
    • https://manuscripthandler.com/userfiles/file/zoxonupilusesipom.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b91f26a44e8---xuvebu.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ccaa3f2dce5---39607522714.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adbb6005e7e---lemapamomoj.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/42728121417.pdfIn PDF document text
    • http://petrduchek.com/files/soguwamimijofemiwevo.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af01d17ca67---49467684344.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ce18d2f40---moket.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f45ec41c---wuluwufiwuxavumufuseba.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848bf7546f4---54749072823.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16094752d84827---84644631192.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091a5228fac5---68665976669.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ea40865b8---89532114400.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abb6aa38bc8---lefobaz.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0b22b9de8c7c576b7fb204cd26372fd6/92986984370.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/33328166101.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/715549838ac8c6e292cd0a6f09de9976/81697189338.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/12308532340.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/6cc7948555404c5926ebce46e548f652/63488883764.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/asvfhnit54v6egi5tuf121t9j5/nejajulafipuvufo.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d622c7ee5a---rubavelapajevil.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/73908294382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=axis+y+axisPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F9 22676 bytes
SHA-256: da2b89ec0549d431d20e7071ad718a1ffb2aaf0149d9aeb2ce8f87dd916a12c7
font_01_sfnt_off00013834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13834 9700 bytes
SHA-256: 37bb15c1d1b10e326e3910a5191e394599f30679698646c246ce89c0828162c6
font_02_sfnt_off00014d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D5E 2876 bytes
SHA-256: 210574e7112b1ccff686ecd3654d2d400197b5806ac1436672f4cf66abfb8929
font_03_sfnt_off00015911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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