Malicious PDF — malware analysis report

Static analysis result for SHA-256 4587cdcee28a2f1f…

MALICIOUS

PDF

74.4 KB Created: 2021-09-07 10:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 74876e2b9fa755eebe154ceea24c594b SHA-1: ae518a084f21e0169a52149f0b7643d57e1ec282 SHA-256: 4587cdcee28a2f1f1e853623d2aabc001593437cf2bd79699ecf6597e2dfd53a
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e912fa6aca---96341855602.pdf In PDF document text
    • http://escuelasfutbol8.com/docs/files/97309899301.pdfIn PDF document text
    • https://renewone.de/files/77820391301.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d037e5241---zupajisefow.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891d8fb3f2d---fakoxowulutapifanabosega.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/juvufogujipigukagige.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/lufozel.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/14163917647.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/32475675814.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/xipaw.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160990a970f782---mijajixujizisepazu.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/53913031209.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fafbc16054---9105435463.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d918d723f35b8f25d44611ef814d7182/mewumel.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e83a234966---27714631848.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/31845557107.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/bisisepowebekumuwe.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/c45c5e4e2b7466813b27f22ba3ec6d88/wozopis.pdfIn PDF document text
    • http://amdind.com/userfiles/file/vomivelanapiluke.pdfIn PDF document text
    • https://seikico.net/img-tym/files/mologezufewunulubizizeluw.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dfc056938---norojabuj.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/71566017104.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/gavepo.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160817ac6e05d6---jutidomok.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a2bf07e5b4---88115060633.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/92456629457.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/rulinuri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=lathe+cutting+tool+geometry+pdfPDF 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_off0000c037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC037 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 11072 bytes
SHA-256: 8266ba10b02ee6b6a09ca5f10dcc56c95062567bbd6c4240122f609f182e898f
font_02_sfnt_off0000f1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 16416 bytes
SHA-256: 5e7e1ebf1daf69efcaeabff09472ee814d2b421598740220333c72141999e72e

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