Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac14defa213c242f…

MALICIOUS

PDF

86.7 KB Created: 2021-08-10 22:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2bae3b871e7ca06393c58a94bac0703 SHA-1: 0cc16dd7e72777f93070e66079ab26933cf099ed SHA-256: ac14defa213c242fa145830202c7d05652f76d2dfa39d11a858c38e2a3dbd536
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/cbdb35997e3b490ec1d885af8a65965c/namitivoropabo.pdf In PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/feea536bc728ae7a50c6a9838fa57799/tapolazapenaluvipoxa.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/punel.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/18980699670.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2732c7e0ff---69795146846.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/jumaxopexupexesipekefo.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/82028171441.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081d93d9dfaa---57628875214.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d651024310---81445539244.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/7395685f5e3056a08807484e7262d3e8/31030838704.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/44144364432.pdfIn PDF document text
    • https://atl-50.com/files/file/24884442025.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/xosuwi.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/75a2f0a17825b245a04a91219db81795/36039452150.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/1h1pbdsglfmk4fop5m3bftr63k/sagimogapimulosi.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/66860177192.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/19205379732.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/bojafilaxelaxolopevoj.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160addccf37318---negafenifabewewexuf.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/72209fe31dc020f3fd3e123d5919ff71/74539072687.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/c3ab482b1812b274093013aea726ce58/dulesokufupafopisudepu.pdfIn PDF document text
    • https://medius.sk/userfiles/file/zipijenifejuf.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2dabe3610---tetenibaj.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0739786751---woxuberufefotebidixuworo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=lego+star+wars+the+force+awakens+poe+to+the+rescue+red+brick+locationPDF 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_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 17068 bytes
SHA-256: 81db482ee0b1f0c16d3081a3ec761bea422a01ea862c999115483237385e1b3e
font_01_sfnt_off00011a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A08 11276 bytes
SHA-256: effcda2a0936db9545006177dab5f68c3b1f2e664b1fa9e9c2d3ad6e82e3e52f
font_02_sfnt_off00013416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1