Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6fc46c8110ce19…

MALICIOUS

PDF

86.4 KB Created: 2021-09-04 17:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0dc8e084231de3b4c91a6ffea692dcf SHA-1: 8b49c94441b5d0f735047f9639cfa15bf9474277 SHA-256: cf6fc46c8110ce19835361bc835a7463c85e6ac7d8465e33f47752335b4b78e9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The document body is unreadable, but the presence of many external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://woodwork.pl/ubezpiecz/obrazy/file/23458961547.pdf In PDF document text
    • http://teplo76.ru/uploads/file/xulif.pdfIn PDF document text
    • http://ashioke.com/images/library/File/35217246372.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094a4e68ba4c---gepabixasojemim.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/29115319390.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/c9mrmvpv8oconc4mmnpffo45h4/lofizusaripotud.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/99c08dc756f5b2bb003b628ce24688c5/pipevob.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/figujitigata.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/foduduzebetekeripe.pdfIn PDF document text
    • http://npas.ru/pic/file/40374271070.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/binazebuvuvepidaw.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/pokuwemikepedusategusiweg.pdfIn PDF document text
    • http://abnicum.com/files/file/fejijinuritugure.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/3997217633.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/mabibu.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612c59e6f3dd4---fabede.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/05f0bb91010f2e70f3c140f5ba53135b/sujedumilezos.pdfIn PDF document text
    • http://candientushinko.com/images/file/kowepisuwuzamesozigen.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e89407d0da---lifinajulurewafutofa.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/2bb91833ef4fbce6f99d6e651535661a/99691218460.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/19124de0d22666a84edfc3d965867844/75352753240.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1c31a4ff1---87954014238.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/pipadenividiwe.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/gubetovidupaliborivise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=math+aids+long+division+worksheetsPDF 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_off0000ed31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10548 10764 bytes
SHA-256: cdd0f62e99233817053795f6d3108ac608869824fbf4c427521f4490f4fe5fc7
font_02_sfnt_off00011dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD2 17816 bytes
SHA-256: 250e588213398bde777adfc250dba89026053a9a1e6779b1a384eb82ee9baaa8

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