Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fee24e5ae3ee83…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 12:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0ef2fee4683307810e793e1cbeffc576 SHA-1: 35dd9e6c6b210c9bf37dbce29914de1e82cf8ffb SHA-256: f4fee24e5ae3ee832b4b77f9101dbb2d5d28228f03f7db6c81d5a1b09f0d40ad
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous external URLs hosted on potentially compromised or disposable domains. The primary attack pattern involves luring users to these external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=clinical+nutrition+books+pdf PDF link annotation
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ctog8k8i2mp5dhq8dg1d3u9chv/64572626718.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/zakotevuv.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/kd99oh5go3lvsencjsmfgpu9u5/44508871257.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/eb1afbf14438016f41d303f7797a64b9/revegunazeredukixu.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/81754335692.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/66699184690.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/gezuvamip.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/12112398db0040f0a5da2a516bf7259f/dowudaserolodakodaz.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b276efe516b---kagokomodozexabitenozekap.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/f913b6b17153e15214bb64d90e0c1495/2548805268.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/bijewowotezab.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/11fdb6fef6bbcfe6bb762fa919ce5c61/52457519388.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/rodorafewufuni.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160ae610af109c---73265199175.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/movixunibogi.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/11849142194.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a34839cb6---86401802431.pdfIn PDF document text
    • https://thehouseproduction.net/file/56495888595.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c0586e987b6---68043093882.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dc8443c3b39---70326053287.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/gobolesise.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/f9e563179d871744018284caba10cdd1/82440100461.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/j8oh82f6e672jpaossdlt03262/zeremapipumunatojatawoj.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/xusewo.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_off0000dad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD7 10844 bytes
SHA-256: 6a01477f86a6ee8c65fd3b074208550d8361f58f5547ae35f8716a095f4f84fc
font_01_sfnt_off0000f3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 18996 bytes
SHA-256: e0a102d43526cb7dd39393df34e8941e2f8c7942586d0d09b211358a67710961
font_02_sfnt_off00012559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12559 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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