Malicious PDF — malware analysis report

Static analysis result for SHA-256 50516a35bdd49b41…

MALICIOUS

PDF

92.9 KB Created: 2021-06-24 05:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f455b9ea5501a35d8684262f8a1316e SHA-1: 94d62e09ef4569553d902ca80df17afa53861ea5 SHA-256: 50516a35bdd49b41e03ea4dedd08605ea49e3030fde067ef8e8853180b4f224b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of 'Red Dead Redemption' in a URL parameter suggests a lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ae0067ea1---67952704932.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/wuwidajisaza.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8980763a4---39160337208.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16089c960206e4---88102644645.pdf
    • https://prtl.pl/userfiles/file/rupumo.pdf
    • http://n2nlah.org/UserFiles/file/tujulorugewoxureto.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/4a7b438fecc5595437851a0a5bd8ae74/85679067635.pdf
    • https://arvikabc.com/images/uploadedimages/file/2274172459.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bb20270da---bipodafomuw.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/8164fd6690d9479f04f5d4e67520237a/17142237672.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960c339478f---2671998363.pdf
    • http://cukrarnakolbaba.eu/obrazky/files/pogemop.pdf
    • http://zonazero.es/userfiles/file/lulesiwepubeduluzujap.pdf
    • https://aawyx.com/sites/default/imageuser/file/gakivisivujog.pdf
    • http://tutaylamhet.com/storage/ckfinder/files/16984756740.pdf
    • https://netshopnepal.com/userfiles/file/19158305136.pdf
    • https://canionglobal.com/FCKeditor/file/popop.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee8fb65d1e---tilowi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=red+dead+redemption+series
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126e5.bin
5c41c069912b0a7d5e064a1fa487e764eb9d5503a43968dcb6445dfd460f1899		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126E5 5080 bytes
font_01_sfnt_off00013815.bin
c33050373a4d5f8b669c6c1ef3896415223c0e413bd4c5a241cd93f73c7a8dc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13815 14552 bytes

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