Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0508791d12e63ca…

MALICIOUS

PDF

84.5 KB Created: 2021-08-11 01:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9cfbd701041cce3bc6e7952b3a185227 SHA-1: b1c817803bebc24fa5f746a119752f44bc21a91b SHA-256: c0508791d12e63caeac41c2bf2854d257efe6074561913232e71523e2d64526c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URI links and link farm heuristics points towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://areicon.com/images/file/zeregeg.pdf In PDF document text
    • https://ajitcoatings.com/uploads/13974189773.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/32396798393.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/vksrn2duc30sj80ovi2f8tab3c/xowurikol.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812c78304af---vojekaruzaretisizap.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b173defe38---88137344617.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/95231815509.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160881e74b0651---93558448633.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/36745302129.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/39736769406.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c358012add4---wusaburoz.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091f972c036a---60311969839.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/4181a658a1628d1ac67f81b95878f843/goratajavugixe.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/57325523523.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/jomupen.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/suvudisopu.pdfIn PDF document text
    • http://cooleywestbrook.com/clients/865832/File/30155508419.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/32983caadb0f8ed8bff621aee91fea67/xuduwe.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/57320452098.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/moregazusefogajemakus.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/73331984199.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/g3fkada6qnjaru8ubln5q6v7ro/63224529389.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160913a1702b81---5404660759.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/694ccf1c06f9941205a473f647621edb/vixovobasasevizaz.pdfIn PDF document text
    • https://cubic.is/userfiles/file/fejetikavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=find+the+orthocenter+with+given+verticesPDF 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_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 17648 bytes
SHA-256: 08507e780e625c515e135237413f1a57ebdd273ebdba4a8ba818bdd5440a7267
font_01_sfnt_off0001132e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132E 10572 bytes
SHA-256: d638244f9c0d78f0a115196b4bb2176ac82d0aafc9eeb697af73f721ec28c60e
font_02_sfnt_off00012b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1