Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9216937a0f1abca…

MALICIOUS

PDF

95.2 KB Created: 2021-06-22 17:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 905a097302729456fac3e2d6426f8506 SHA-1: 71dfee8204f81febf5a4e5a9519e0092a65faf3a SHA-256: e9216937a0f1abca71fd4f9e0a8292b280ae351010d950e44a04843ebfc013b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely serving as a redirection mechanism. The embedded URLs and the nature of the link farm suggest an attempt to lure users to phishing or malware-hosting sites.

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://philabc.ru/uplcv?utm_term=baofeng+bf+f8+manual
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/55744275050.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774a8150b08---79541418188.pdf
    • https://peterdegendt.be/file/buwodijujavumonogagejag.pdf
    • http://cottoneauto.it/userfiles/files/lugulovojoponufovijera.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a19c4eb037d079cd261bb92ace1108e2/79760889474.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c444fa931b6---gajarebaguwovulisuwu.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/e1f03cb9a4e948fffcb94a70174c5afb/tikafodazijofiw.pdf
    • http://domholidays.com/userfiles/file/66043555633.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/b4f228b01392bb8ba02ace680297c106/bamifesabelatamogikelav.pdf
    • http://laweasy.kr/userfiles/file/lobovisolededotomonoza.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160845cd902c0e---62821336079.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/9t0hvqusc7v0ppbsts6j1o8d0q/45709199043.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f54838c59---90953727564.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7aa748916---sukiregikarafajilarimi.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1335d607976df8d596589026d1b4963a/japud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000fe1d.bin
d443b245ed52fdffbe45535b2e9c93c6f68599b1beb93ae62b91e7321ffb125f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1D 17852 bytes
font_01_sfnt_off000137ca.bin
799d3a809492b55cba805aee232968c6bd518e81c0b359bc7e98df2650425b42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137CA 5196 bytes
font_02_sfnt_off00014970.bin
eb979cc6fb0dde3219b55f72114835f8e0380936ed6a61cb6314b47aa84dc347		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14970 12728 bytes

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