Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0cb7936c50cf36a…

MALICIOUS

PDF

69.8 KB Created: 2021-06-07 05:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f59e92b59e557ebb70955c0391200c5 SHA-1: afe5bef199b7e6b804b2a7b6d68ac96c9d7b2555 SHA-256: c0cb7936c50cf36a452ea7bc7d851f89e30979e8f4b6684667555143f0c75075
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the heuristics strongly suggest this document is used as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/uplcv?utm_term=cake+serving+size+chart+australia
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607f078d58bcb---lisipivekefasewudawa.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/g9mjagn6kbj7evv7pfigijp106/boboju.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a2697e6526413bcc0d70a758bdb35a20/dupatinuna.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d97a5be66---80532427668.pdf
    • https://anmimar.com/royal/userfiles/file/15942565211.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/c176f1746fd5a91613fa1885bbfb905c/gagijefakatubiba.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/3b20a0bae96854f0a59d2e812b51b07a/belokerapedagod.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/edea04bb0e4d65e486e95aa339ba53ac/wakerewunuzabim.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/dab3cb50476d001e11c8b22f38accfd5/98472380985.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/878661ea7edc387b1cb5c5872cde5126/49835478179.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a71ce5edbb1---44703465949.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9cf671745---62020219055.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/aeb003ecc86fa12672113460ce85fb20/8108069491.pdf
    • http://anatolianlgs.com/userfiles/file/74079577921.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1faf014643---53606890274.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d215.bin
0194350a8c5e59b6e585d25571241bb03fbf821602dec555e2669974fdb37dd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD215 5140 bytes
font_01_sfnt_off0000e3a4.bin
a46ab55a9bda1380f42ca60574e13bd3dba9b69ab3a7928afea799a0384152c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A4 11048 bytes

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