Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed21404ffd1bdbb…

MALICIOUS

PDF

88.6 KB Created: 2021-06-27 18:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 031a8c59c6d4565ce87247a76d362e40 SHA-1: 34c64af50f8fc4726535b2042733c52200be752d SHA-256: 1ed21404ffd1bdbb03dbab8f7e93e17b6fc0d7e3f6b7c3e2ebeaddb8abdec468
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbabb24cd17---71495255410.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ddde6a814---88923763822.pdf
    • http://babywagen24.de/userfiles/file/88393021765.pdf
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/rhg48to63i0du5l95o8h6tusjh/rizarupevixetedimelujo.pdf
    • http://innospectrum.eu/hirlevel/file/todowupixekebakof.pdf
    • http://learnersdigest.org/userfiles/file/90211286152.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/jr3hbh2eaf1puaos5178rs9ooq/parugatunawewipazanenig.pdf
    • http://gumberryoleschool.com/clients/33891/File/83905644967.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cac42a9972---27579428036.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/a6c3b71634837bf7d67d7e3df5074c6d/xisiwokovisal.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4090456e48cbccdf46ed9190ec39d568/14393612891.pdf
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/zovimafideparupadanuzeku.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160948d9ac309c---89057393232.pdf
    • https://alixdemassy.fr/userfiles/file/tofejipenutumemisubexav.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f33cd6160---79054474287.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882bbf261ca---zozobokonilowopubalofese.pdf
    • https://akita-inu.lv/www/files/files/98613046728.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/5kdsag3a70lddcclt50bsdfgmv/35572746345.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/94ee9918735aca095a13ef7d2157ec3f/lorokixusu.pdf
    • http://short-story.ru/upload/file/sakasekekovozelodozimo.pdf
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76004426287.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41d1ed7c4c---67547975323.pdf
    • https://ludifrance.fr/userfiles/file/safolabasedivo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=dance+me+to+the+end+of+love+violin+sheet+music
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f661.bin
36ed28a57cd60db2e5c9b3ead4ac3e73f299d4f956e0aa3d70a8e2e9f91d6bc5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 17564 bytes
font_01_sfnt_off00012406.bin
1899d67d3ab30dba75d267bcef61b6d145a3d9298189bedac09b9ced811934a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12406 10808 bytes
font_02_sfnt_off00013cc5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC5 16792 bytes