Malicious PDF — malware analysis report

Static analysis result for SHA-256 991cfb46a81fc5cd…

MALICIOUS

PDF

101.4 KB Created: 2021-07-16 04:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ff26f7e5b0ad42fa1d52ebc6c8206d7 SHA-1: 1113c11cc8c0131f7fd85eb0d8799546a9754fc0 SHA-256: 991cfb46a81fc5cd7c5a3ea76a62070d791036b070b6acc20a075675e34ae665
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many pointing 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. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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://livre-art.com/ckfinder/userfiles/files/bijamozi.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ssuk3ne7bfn9aubo5d7h8a6k13/74684389704.pdf
    • http://szao-spb.ru/images/news/file/bipejijijuwokalanalowe.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/54dc7a1090b12c69315ab64bdd7cb1df/nusedarizireralofike.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9217be41e5---4257247448.pdf
    • http://studio5r.com/userfiles/files/vokusaxexewup.pdf
    • http://sosnovgeo.ru/userfiles/file/67621581858.pdf
    • https://gitedu.in/ckfinder/userfiles/files/fobemi.pdf
    • https://insolite.lu/img/userfiles/files/nesawarizudegob.pdf
    • https://louvre.lv/res/wysiwyg/file/93323192253.pdf
    • http://ahkjt.com/upfile/file/vapafusojasijapafele.pdf
    • http://suleymanporoy.com/img/userfiles/files/72360597289.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/2679b9a988dedf0128f41b23a0ac79ea/pifopa.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/f888715afcb007399f8e6c09178bad97/12383601998.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/6nvf8u3eehbfmoupvrd9malvl4/36887662287.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/0b16bc8ba82f0aa1cbd3d03b409996e4/10014456223.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f7c34fb1f---vavizujeminifudewujenozo.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608579ff7f12e---leritepijerafemedaperiv.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/e8t504ioin2kksdi4q55fuf1jc/79928859699.pdf
    • https://vipbeachhouse.com/uploads/editor/file/5182162431.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa1c1ebb04---22180543801.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/0bd9f4214f9ac42afae79a55d328575b/92210391346.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3afceb1e7---2475069115.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/464fc0af592ca25de99892ebfaaa8f46/lorozitatuwevesanino.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ab9a034tmnb13kmpuh9rqq4n20/kazolewe.pdf
    • https://chp-travel.ir/data/file/kidowinitevutoximinape.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=hotels+near+me+with+pool
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012807.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12807 16792 bytes
font_01_sfnt_off0001401e.bin
6d23bf8b2850a149b728f378a5d90591f479a251075cfa14df4f84ec095837cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1401E 10596 bytes
font_02_sfnt_off00015823.bin
745fb8756e44633ccfc30598ce71be943bfc13d85fc8f5e58e30fad775bf439e
pdf-font-stream PDF embedded font (sfnt) at offset 0x15823 17924 bytes