Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94f76f1be3f9f66…

MALICIOUS

PDF

87.8 KB Created: 2021-06-28 02:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82d86ba70aad11d74272bc562f96a678 SHA-1: 0a8f2e8df67ea37df02582a158704c0b15c3baae SHA-256: c94f76f1be3f9f66d67a44a679e5b51221dd0f94c15bebd1d1f87baec3f07cef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, likely intended to redirect users to phishing pages. No scripts were extracted, but the presence of external URIs and the overall heuristic profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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=blind+side+ar+test+answers
    • https://faresaldabbous.com/uploads/files/5690257210.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/0b9b1a4c0278980099166ba20dcf58b0/vulogaxube.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/55c0e468a281bb33a8b538e77523c9a9/mizonulotukozu.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/e1e9a2ab162a2ccfafcca9b60f48e00e/76842349223.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609386c628317---rufaxulipurovugezipapugu.pdf
    • http://quickvideo.nl/userfiles/file/58400391741.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/jkfspj2qgirp74mv7iv7upi88n/44129752595.pdf
    • https://medtek.vn/storage/file/kojijabedup.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ijdp6pjsork0opllqbp7updp73/xoluduga.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802cf306b4e---80400617956.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f08b25855---domade.pdf
    • http://tamker.hu/userfiles/file/95919701029.pdf
    • https://unosms.us/userfiles/file/8187332121.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075995f6a2f2---dumusaxelanujesufuxa.pdf
    • http://www.oiseaubleu-promo.fr/userfiles/file/21387237715.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/39c072d2c905ba12b893d37587013ddf/55963500686.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/e29fd163ca10bca47ca887bb7e2c189a/6544467454.pdf
    • http://aytekinpolatel.com/image/files/34324213634.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079a92744762---19786291455.pdf
    • http://atdawnwelift.com/userfiles/file/dufunidileroboziwogume.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8547359b80---87569355452.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804516f026d---43430677658.pdf
    • http://kibbkw.com/uploads/file/65557784275.pdf
    • http://asea-admin.com/_userfiles/file/20210522120023.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607183152be92---gesasosapuw.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/5fab95f360f8917db3d9e9fe4bc74069/pixejijuzato.pdf
    • 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_off0000f0ff.bin
29516f95794bf4bb09e812302b179fb96da81b7bd77f2123cf2e7ba76aecb3c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 18996 bytes
font_01_sfnt_off0001211a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1211A 16792 bytes
font_02_sfnt_off00013931.bin
e7cef7d87c6b93658f90b14fc41e92614d1b0bc76a8ac9d111a977f971eebc1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13931 10260 bytes