Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f83c79a5b12a6f…

MALICIOUS

PDF

78.8 KB Created: 2021-09-07 18:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 388c43bb17cc17d1be5e74e0d3db8149 SHA-1: 125ff718c52c2194e1492ef19f29a4f4fa50bc8e SHA-256: f6f83c79a5b12a6f7a621ae4bf2939e4a952c2043354c433e1590dba6e9c0bde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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
  • 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 https://wastran.ru/uplcv?utm_term=future+tense+pdf+download PDF link annotation
    • http://s8radziejowice-paszkow.pl/userfiles/file/digovominudelagiwebajox.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/84763465204.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a012608318---57786978249.pdfIn PDF document text
    • http://henca.com/files/details/file/36599754802.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/29472110770.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cba87c8b94---daremasomeloni.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160affced79d5a---vusegij.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160cdef7b90066---60169612828.pdfIn PDF document text
    • http://abworder.com/uploads/files/13379732895.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/37395577091.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/46297533157.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/68436473601.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/79251660140.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f0f28b145---bagepobolife.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/74b6e01510847fe4123fb54dd73dce6b/refosebiziduz.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075389c5c00b---79707429885.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/59841581072.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/sapofupovedazav.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/0ao41ui3m45cc6br76dr6ha5nd/wofesewe.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/66041425936.pdfIn PDF document text
    • http://ladakhtripmaker.com/userfiles/files/14632626014.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/20899936288.pdfIn PDF document text
    • 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_off0000ceb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C9 18264 bytes
SHA-256: 0b26f34605b83fb770400baf77f3ce6a59e792c54654fb7a1052b4be13758d30
font_02_sfnt_off0001157a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157A 10564 bytes
SHA-256: d8e43b999c58d7176e5998008e8ac7ee57448822dfdf0c3ef8f3d75458152a84

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