Malicious PDF — malware analysis report

Static analysis result for SHA-256 03bf98933b844687…

MALICIOUS

PDF

75.7 KB Created: 2021-09-16 03:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: efed4d80db77717604ab9563f589f8b5 SHA-1: c5f1fa3c5270d786d89a53fbfa893b9a8c6fa3cb SHA-256: 03bf98933b844687fe8f5df0854a877ea4ae984a72dbd351e0ba4646c2a11cad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to disposable hosting sites, many of which are disguised as PDF files themselves, suggesting a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The embedded URLs and link farm structure indicate an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=p%C3%A1gina+web+no+disponible+android PDF link annotation
    • http://bodybybodyology.com/ckfinder/userfiles/files/pomoxiwun.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/ralivitexevugivixi.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/15417450553.pdfIn PDF document text
    • http://dgjst.com/upfile/file/fefametafebubo.pdfIn PDF document text
    • http://master-br.ru/img/file/34233981966.pdfIn PDF document text
    • https://emenu.hu/editor_up/jisutefipupinuvito.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/zenewepevikaxopoxi.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/600f1bade2e552ff7e9522b4a3ee6a08/lixid.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16137b6caaf682---45348720554.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/bavizewolijibizike.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/xosilikisuxibariwid.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/zutivunama.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/91042567735.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/bixubekuleso.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/61918245970.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202108312036072823.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/4727355078.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/dikufatajejajoni.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb12cb15c---sevaperexotedisawupe.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/jitirekitumuwito.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/gozimevu.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/mivotosofe.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6fba96b84---gubazugibaritu.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/kepamezijen.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_off0000c381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC381 10876 bytes
SHA-256: 7631a44599b4cdc3615ab901d4d5b1ff669bcdc4d5b8d940fbdf07479efe5a5b
font_01_sfnt_off0000dbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 16632 bytes
SHA-256: e8113d9afc6b07dbda818c3900795687247bf8b49a657dc5fac46d6f9e1e52ed