Malicious PDF — malware analysis report

Static analysis result for SHA-256 239c903b82d2d366…

MALICIOUS

PDF

150.2 KB Created: 2021-05-19 07:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e3d71306e805fb5cfaa6c91dbd869a4 SHA-1: 610eb9b8e8ae999f8192eb662ed0ec410ffec122 SHA-256: 239c903b82d2d366810d886fdade3f11a306725a6574e35880ee913691854685
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, a common tactic for distributing phishing pages or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/3f0uf32tpct756etm375iunrk0/52409131446.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/vtqv63s71j45blkvhr0r85r8qf/18125938313.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782d39c64f4---revijukepe.pdf
    • http://abc-tel.ru/data/File/70466664513.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f644adfe92---subaledirixib.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a154277c0c---jetubi.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/f1eba78762fb35e95dcc008015d20522/pebobobijawepoterotut.pdf
    • http://humanitool.ru/userfiles/file/33053245771.pdf
    • http://ankurgroups.com/userfiles/file/33707937441.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/01291247a25d6fad99080f4ec455fba8/44963354682.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7c170a5d5---7876266604.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/8521f8ba673bbb3f8bd1e4144d8a67c7/lazojufetadeg.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a388eaf1585---wimad.pdf
    • http://quickvideo.nl/userfiles/file/53228323573.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/t3eq0vl9brmna55e6kkrjhqqv2/kotodevas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+clean+printhead+hp+2135
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf26.bin
06d3f9e849b670e9d2200958f50267d5eca2aed5e5b20cd621213c4fa648438a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF26 110164 bytes
font_01_sfnt_off00021584.bin
a778fc3c388002a8926538e6e9205cd18975ef7ded7d7601944ee1d17fcbc48a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21584 5508 bytes
font_02_sfnt_off00022855.bin
cac09d392edcf1de6200341f8082039e81cf3e5b2ba00ab61bbafb6d57b8b292		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22855 9472 bytes

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