Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49e647090639e32…

MALICIOUS

PDF

75.0 KB Created: 2021-08-28 17:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e2912ec55490dd33773e9b7668fbd757 SHA-1: 8dd325e6ed6bae51effceb303f2c0235820fcefc SHA-256: c49e647090639e320d9db6fd30446ada9bcf262d06fa92fb9f82915fb603c480
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to improve search engine ranking for malicious content, further supporting a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=data+transfer+instructions+in+8086+microprocessor PDF link annotation
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717f5831d9d---80286584408.pdfIn PDF document text
    • http://moneymaker-gold.de/files/32019889018.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/98289170500.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4aac64e0a---vipod.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/79400473098.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077d3a0331f3---22084950685.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/85218887481.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/22014667026.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/nuxezolujoxewenoz.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/78022605962.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/6c9ae1383811e14d9766159a619f88b3/3488858973.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/62091288607.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210620131622_1u7l7l.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/88153301988.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/380acb0a94d1eaa8ac23ddcdd8d39e0d/tovuv.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/pekurawuvelilisoxizonetun.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/788548488.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/sawaduri.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/qs49978gmel0t987krc15tehu5/sepul.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/tapopavazuxeboropinitaxow.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/totelasoxuduxozejudilus.pdfIn PDF document text
    • http://fxmeat.com/upload/file/e83711566b86165b0079bbe783da2973.pdfIn PDF document text
    • 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_off0000c1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EA 11192 bytes
SHA-256: c888380787d0c694a3b75722e9df7a3e914c0c3016a99644aaeb92a50897d5a7
font_01_sfnt_off0000dc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1C 16256 bytes
SHA-256: e79b5b2cc589cb9f6db76c9efb97b25632f11a216bc48d630bd0474e77da4311
font_02_sfnt_off00010644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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