Malicious PDF — malware analysis report

Static analysis result for SHA-256 46cb5d58d194f7c1…

MALICIOUS

PDF

73.7 KB Created: 2021-09-03 18:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76ab77a1ec2b1300acce8281c9ded328 SHA-1: ee8be91cb257275133a3bfe8bbfaf9e07580491e SHA-256: 46cb5d58d194f7c18029fb2c40afddc3a954c8c1fd182afbd3f14f99cfb1b0bf
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites, likely for phishing or malware distribution. The presence of numerous unknown URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/19365b8abb2f6e348736491674793317/63432652231.pdf In PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/ravagi.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/6b9d05e91863e3149a4a62f7b7becf4c/71581863548.pdfIn PDF document text
    • https://autopratichesas.it/file/mesenote.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ded852f22c1---makuk.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/107e205b3cfc1806adcad99df364305a/53884773227.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/57899305766.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/12051327587.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/51008a7039de39cbcb9f6c0644941fe2/kobejevopinarisitugutok.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/4orlhpil8s2sbhluhbjbmnigs0/16928165498.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/18703711809.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/sivumuvetigipefawedapapu.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cbef08a20---zojilesasuvamirugoradomiw.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/44623446748.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f177a4893c---nonilikiwilenaxokurewu.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/4053794654.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/kanederanufulok.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/6407e1450d926b61746a29508890ae14/tonajuxidizedowelopeberiv.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/4fdf6bc176089f2fe21318d32326561d/69594512692.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/8f8cb2acocb62qdh0d2cd4llc2/linakagejusulezuzu.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/26591875759.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/58248085557.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210625185901.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/49679896031.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24064144724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=candy+pdf+proPDF 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_off0000bf21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF21 10100 bytes
SHA-256: 11102d0cc3fff203e444a89e8f378625a182481ab3cb1e61048ee6672175fbcc
font_01_sfnt_off0000d5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B5 16964 bytes
SHA-256: d4a6e90184787e29fbca30833b64213f82af7c89a00ccecb4beee95c8d632c76
font_02_sfnt_off00010176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10176 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1