Malicious PDF — malware analysis report

Static analysis result for SHA-256 28eb55bc7c0318cb…

MALICIOUS

PDF

69.9 KB Created: 2021-09-01 05:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b45c9da6def26106df4a87313be88650 SHA-1: 5bd6aefb09a8fc5b53d25e718973850353119372 SHA-256: 28eb55bc7c0318cb0176382c803d719377796be083666a21b83bd2d4bb3c3045
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://wsm.hk/images/uploadfiles/file/totivuzuvudikob.pdf In PDF document text
    • http://podiummoda.ru/userfiles/file/84288199960.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/38175829544.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/xenogonurek.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/30653602787.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c857d6088cb---62796320525.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608177f630383---mafixekiluranilaxagor.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/59978607328.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/sulop.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/bupogapixofe.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/27807920ae903f9c2cc4372910e32527/30188937131.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/pevurekotexokixedebekuwix.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/xumoti.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16071415140917---50640767108.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/i901o8p1gdc5fo46sajuo1q6ve/73451662875.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/fifosebavakader.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/94689261913.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b066ed48d---9693309768.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/5a814faac692cdd4a0cb30638f776d1b/jiwanu.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb2cdd3f31---foweguvadegupe.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/9691088640.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161281cb18355f---75691420820.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/62997906142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=describe+the+elements+of+culturePDF link annotation
    • 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_off0000b611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB611 10680 bytes
SHA-256: 5adc7f73435ce1c5fb73914b430c9a80e3aecde151d0c775e87e8d207a339572
font_01_sfnt_off0000ce5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5E 14336 bytes
SHA-256: c221c32d07fffc70c19e2586a5a47ede11312566c1557bd538d21c3bc8f8c252
font_02_sfnt_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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