Malicious PDF — malware analysis report

Static analysis result for SHA-256 58feddffae19db11…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 13:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 215cda40132ef466b7bc854bc2379eaa SHA-1: 53f033025bd877066c84c46f2db0cf2610dae51c SHA-256: 58feddffae19db11ee9d5c08bd17c434362be1047379f93cac5d3ca24a287c7c
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains a link farm pointing to various domains, likely for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic suggests links to compromised WordPress upload storage. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://oniceh.ru/uplcv?utm_term=the+dungeon+seeker+pdf PDF link annotation
    • https://vibingvibes.com/userfiles/files/60582094806.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a1ff18d6ce40a19ce53f5e116f202999/domulo.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/82864030501.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609890f6d4c0e---71760526682.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/53024074302.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/15021261319.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/26157642696.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dc0475624---lanakonuxapegezusogol.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/puporaxizusadirum.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/gudesebuluzudoxutirafe.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/96p4uslhves97552vbogm540ks/bafegi.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/kunadovikadezaw.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fcab1b1f2---22601958769.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/bolitosopekinejotusoxefi.pdfIn PDF document text
    • http://www.bandungmesin.com/file/puzikixawup.pdfIn PDF document text
    • http://m2m2design.com/userfiles/66055541994.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/44627192238.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/burej.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83c924acd5---rovutosulosilojafe.pdfIn PDF document text
    • http://rilta.net/userfiles/files/xuralovepogokedevixojava.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b19d140b383---26853171903.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/aee6d3ee9289da3a9f11b35cbbc2336c/95464157574.pdfIn PDF document text
    • 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_off0000cab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB6 10532 bytes
SHA-256: 37b75e7adc9069298a08702adc5608d37a4e38181df02575f33bde02ac0a32ee
font_01_sfnt_off0000e268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 19692 bytes
SHA-256: d26b781a3048907bbfaa7d5cb24a73235d87bed5070721254f297e2c13370f1a

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