Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d0a0c961f5e3bd…

MALICIOUS

PDF

89.4 KB Created: 2021-07-22 01:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 64c310a8beb02f1993329fa4cb237d75 SHA-1: 3aa4f1793c20351f4619d8e86b39c87370d1d33e SHA-256: 46d0a0c961f5e3bdf704b629a6e89a15054ca071476e1eaaef7f7f70e870167d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://hobbes-group.com/upload/files/89959386220.pdf In PDF document text
    • http://hwayinn.com/image/files/20210613_072106.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/toditojed.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/zawadixamawed.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/tovoxasapamifege.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/ginoranolo.pdfIn PDF document text
    • https://luminex.pl/upload/file/nasum.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/xupogalafunuwojusipuni.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b8228cdba---tarelexajuzu.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/84420973268.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/76552765975.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/5bg6g3n20h1rs7cf6lmg8mkevi/ninoberugopus.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/71b07ee3576ff59210a1ef39b9a4895e/87889346114.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210611005305609.pdfIn PDF document text
    • http://charivne.info/images/file/76420836536.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9ea56d0227e275c298ecc6659ef8751/51949219823.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/35654519356.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8a33854029---rinixuze.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/18273820161.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/lefunuvazuw.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6e210815---lowitoxazej.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/a270fb888f5aa4ad8c76eb0c15f037af/tanesotizizawiruxijul.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb1cd1dc9---63961438588.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/58593207541.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/73078a726fcf8dc6ba3fdf438bdcac1d/sasitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=dominant+and+recessive+traits+in+plantsPDF link annotation
    • 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_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 10740 bytes
SHA-256: 89ef218f7b5178167ac6dc7e09dcc7010eb1d1a60f2968f58f29bf06551a32e3
font_01_sfnt_off0001102f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102F 17076 bytes
SHA-256: 33ca558f86d462e974169d08f26ec463f4be9869a4a28572129a851d873d7017
font_02_sfnt_off00013cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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