Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b2485c92f4adc7…

MALICIOUS

PDF

84.1 KB Created: 2021-09-21 12:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b60a58d429515feaa5b0b23551a9e4d8 SHA-1: 2a78dbfbe52628fccd534c6fd6e1bb898a827bd0 SHA-256: d8b2485c92f4adc789e143a450936937a3de2f9be15b7e342f2375abf57313c2
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF-specific heuristics related to compromised CMS uploads and link farms further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=minecraft+building+ideas
    • https://adikkeempat.com/contents/files/regix.pdf
    • http://anipetkingdom.com/webroot/img/files/14931401887.pdf
    • https://europawindow.com/app/webroot/img/main_content/files/xavudafolavemiwibudabiwu.pdf
    • http://auto-spec.ca/fck/file/xaniluvebifepul.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161454df266ed4---ranowad.pdf
    • http://art-ball.net/files/file/zajafisivoviwa.pdf
    • http://livestocktool.com/d/files/velefizuzisupedamogapalat.pdf
    • http://videocycling.info/files/file/pasabetogufewopi.pdf
    • https://idd.no/ckfinder/userfiles/files/lisagetupebu.pdf
    • http://emanuelarombiarchitetto.eu/userfiles/files/luzuzoneg.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613396526413b---7283278313.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cbbf329ea---72027009859.pdf
    • https://chptravel.ir/data/file/tosuxe.pdf
    • https://sanidom.pl/img/file/watowimav.pdf
    • https://xn--lenachatka-57b.pl/uploaded/file/51724826045.pdf
    • http://pokemom2.com/uploads/files/zagude.pdf
    • http://eikenhorstgroep.nl/userfiles/file/77627043847.pdf
    • http://massarentearchitettura.com/userfiles/files/2048431622.pdf
    • http://locke-3c.tw/uploads/files/202109210650225814.pdf
    • https://maviet.vn/upload/files/sijuguwoverowi.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614367d8cc8d4---wixulalirexe.pdf
    • http://africareview.in/userfiles/file/50563060733.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e680.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE680 16792 bytes
font_01_sfnt_off0000fe97.bin
c0061a928c9d9d5c23b15ccd868896120741e399da2f2bb0c1bdf2882c32980d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE97 10764 bytes
font_02_sfnt_off0001173e.bin
0cdf0ff09e2a82c63ce5023aeea81cc174b6ba0b597e90e4b9688e89f4653181		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1173E 16860 bytes

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