Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b963bdf51eec85…

MALICIOUS

PDF

164.3 KB Created: 2021-07-09 15:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f8093fefd428877748154c986fbc5ee7 SHA-1: 4a1f2fe86faff7d7a9e76276d9d4fa581e641bc0 SHA-256: f4b963bdf51eec85cbe014fe003866e1616816f63e0d4e5a49f5f439afd01d7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://chcial.ru/uplcv?utm_term=higgs+boson+meaning PDF link annotation
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca6189ca49---16841694394.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/f5b1bb231d6a132da88793884e7a65dd/84806556681.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/73290751556.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/39652479083.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/4330836691.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/buxaxevetesewilekuburofo.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/31616725106.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/13890797930.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/olbfs5043qf56k6t57q25rgcvt/lavewupufukavixazefup.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c01288c6e---wemonadef.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/32924458160.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/36918950496.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/f7e28e823dc0b98216ed741f0c3d5acf/volavigukasenukigelu.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160bc14a050806---rumowutenesopaguxomekel.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/iakchu98cqpv3aec4g2g70mq71/banizazidik.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/7jtmdvtdvo0nvno6j14h1hv1qs/28542551394.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ogbk2ha0f0ml80cskv1e8949s9/jekidesolusiseritamo.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/rovogudag.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/zunenavu.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/2219498791.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/583a986cf3460f6b28ab0e92695ce88e/joxizalakubi.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdbd0153bb---84968758182.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_off00021b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B80 20928 bytes
SHA-256: c773c3940b63da344d5e3e0953c0e2dbc1c08128b306e40fd470b19cca0a6e36
font_01_sfnt_off00025485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00026c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26C9C 10340 bytes
SHA-256: 6a3565638977c46d648e70144af908d38711cb9b09dd3b5e6b87f5d5972df163

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