Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca2769245b8ea4e…

MALICIOUS

PDF

72.1 KB Created: 2021-09-05 09:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe1bfea5dd49859dc8362d182cbf86f9 SHA-1: 8be41df36b25177728629bfc31c30c021597d632 SHA-256: 2ca2769245b8ea4eeee72d8c4cd18488dc7d701547b7e0af2bf64b7a9b0d7afd
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, a common tactic for SEO poisoning and phishing. The ML classifier strongly indicated maliciousness, and the presence of multiple PDF link farm heuristics supports this assessment. No scripts were extracted, but the document's structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 5

  • 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://treasurehunterdetectors.com/ckfinder/userfiles/files/repanawusa.pdf In PDF document text
    • http://maciejabramowicz.pl/upload/files/file/41054959113.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/ruxobe.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612044e1e3b34---jodibo.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/vutomo.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/nuxuxubotugevizikopuzozum.pdfIn PDF document text
    • https://ancoraeducacion.com/images/74561624975.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/8645495844.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610a121919e2e---fupurizekasobigujura.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/05fc98c31a456cc8c2cb03fcafc3f284/4350566134.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/22725728362.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4750ccb2b7---sodalejilo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c97dfaa9634---vebobuginenopexegix.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/pogagatinoxabibubivodono.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1bb24667c---sodojilowopemivebojerix.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/48802987665.pdfIn PDF document text
    • http://lex.tj/img/file/rufisakibupeko.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/sixinokibesug.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/rotinuwogis.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/luwukavizufanawa.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/1de22ed0a70ccdc3e185cb70300116a9/kebujixi.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/jatuzogitumubavozid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=daniel+negreanu+book+pdfPDF 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_off0000b67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67B 17052 bytes
SHA-256: 581be5f146a0cbcad03bd2958b283cbddb33a12448c49a7f9e60fe0029bfa3fb
font_01_sfnt_off0000e27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA91 10740 bytes
SHA-256: 76f3df3db5db224399b876b667632b3c45f7587261eddd008d8bf211dcd0f697