Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1f5d5a80644b58…

MALICIOUS

PDF

75.9 KB Created: 2021-06-15 19:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5a5777b434e8ea5c49e6365b61571d4 SHA-1: f70dbd9725f21857e141dca26a652e6cf047e0ea SHA-256: 2f1f5d5a80644b58ae76c1636754d0d2726dd954c445be75c4979e55542f69e8
156 Risk Score

Malware Insights

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

This PDF file is classified as malicious, likely a phishing or trojan delivery mechanism. It utilizes a link farm strategy, pointing to numerous compromised WordPress sites and disposable hosting domains, disguised as a free PSD ID template. The ML classifier and ClamAV detection strongly indicate malicious intent, and the embedded URLs suggest it's designed to redirect users to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://archism.ru/uplcv?utm_term=free+psd+id+template
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/45120053151.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098441188ce3---neneboxalumuxuloz.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080a3688db4c---12389739561.pdf
    • http://almoheetmanpower.com/public_html/userfiles/file/31125765984.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160966034e6c00---xigodamujek.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62cae9d745---kazeletojiji.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad46cc0a4fa---xebewojag.pdf
    • https://aprilboya.com/userfiles/file/73546669508.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc942f32f2---voboliwigi.pdf
    • http://naturallabs.de/userfiles/file/93772073520.pdf
    • https://hospvetcentral.pt/site/upload/file/65291896812.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/463ab4e49fec4f58079b4b28e2ee6816/15967607083.pdf
    • https://cowichanmusicfestival.com/userfiles/file/13029940330.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/bizonigu.pdf
    • http://palami.by/images/file/6004832068.pdf
    • http://weddingdiy.cc/uploadfiles/files/20210607_020340_4606.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000eba4.bin
8ae74174872f6cd8fd6dd71aa8af5469c52aec311fd6efcea2b7caf68bfdfdf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA4 5060 bytes
font_01_sfnt_off0000fcc0.bin
f98f9e12b77f88d994299b909c227b7b80bf25df003f3f90c9af40faeeeaeb89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC0 11316 bytes

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