Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15072da7910b464…

MALICIOUS

PDF

72.0 KB Created: 2021-07-14 00:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10d8ac2171af850d05302794e61b85b3 SHA-1: a21bc452ed3d28d5e61a972c6b0f37871b3786a1 SHA-256: c15072da7910b464907007a507d7e9961807c68f33ccb3b4a0dddccb025c2857
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=liberty+toy+chica
    • https://soudurelauziere.com/upload/editor/file/56367274395.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/7d98560961db0b84e2a75052223bb74c/bezexonosinejofaxefupe.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/3rt20n8ohmbsmscjr0co9hj6gu/11641368304.pdf
    • https://conexkarvan.com/cache/fck_files/file/41641140165.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/2v1sbdgb003aq1cpkfvdsung93/86476023370.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f825c3a5c---33006472320.pdf
    • http://mintaialuminum.com/d/files/31226507290.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/u4jfmd90ktkgksn2r0vfe4kql9/sotali.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abcfeb109d5---metatutegepeda.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/30ggbttd4j73o667kng0mros67/tofitidaxolawipidavuxub.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffe83f2c7f---73006080945.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7df97cd32---sikulidarobitasovine.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/3e006c6eaa1f865d8521409befbe8480/luvetaso.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f20c4fe2d737a234f1d56be470c5a3ce/27414066902.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/ea0b82469bd86f997c349263cae0e625/85853448345.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859980db3a5---pumijixifofusasonavide.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b3854da8006f6d9f5cca3cf7a244b6f2/fixowewewojajasixi.pdf
    • http://mobydick-band.de/fckdata/file/dekizodugoxabojazemuv.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08e4b28715---14640421929.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c86523a00---nusilusuxotoripuzuzudi.pdf
    • http://klefmarken.se/upload/file/gadopawu.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094134f06120---16735458450.pdf
    • http://amoy-art.com/Upload/file/94472890943.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_off0000bb3c.bin
97af57c71532c17737cf9452b37458bc3d9758e8b243d34022238006e44682b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3C 15768 bytes
font_01_sfnt_off0000e3ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BA 16792 bytes
font_02_sfnt_off0000fbd1.bin
e542f21f9035fb50a683a6c7ff381f344991b5ca8bf4a347d08229e8999e3425
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD1 10220 bytes