Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e6660c695660e59…

MALICIOUS

PDF

84.3 KB Created: 2021-06-28 18:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fecdd8ae3ed216c6f3857403e5cf8b4 SHA-1: c913aacddfd1bf379381bd74bf5e340da60ce5a1 SHA-256: 9e6660c695660e5911d9e5ab9e48901970bf1d4966cfac9baef4d0addb03e3fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of these external links indicates an attempt to redirect the user to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=how+to+recover+excel+file+which+is+not+saved
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/47568275495.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/abdbbddd2ca3af9954bf72a38f2cd671/70619173358.pdf
    • http://sdds.be/userfiles/file/vezawevadu.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9e6d57d08---53398929603.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/830422d9e59efed509193c3009909b06/35056722309.pdf
    • http://brilspa.ro/userfiles/file///60287398067.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd441c5f93---98543258836.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/innico6m3i5rg30q5g9ll98d05/17254029821.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf4ae00edc---36239143917.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985ce16db0c---jejemomomix.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16085f8661e87b---38823212163.pdf
    • http://cpspcb.com/uploads/files/25858938088.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/6464fab98e7cf23a78dba840352f6eae/41646724787.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2a1e1d97d2f7914a136c568911575952/12992327441.pdf
    • https://amatnieks.com/pictures/image/93428241097.pdf
    • http://ajtoablakcentrum.com/_user/file/banebituzojug.pdf
    • http://homeopathyhongkong.org/files/24925369200.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075806a1265c---92995471225.pdf
    • https://widepolymers.com/userfiles/file/pikujivuj.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c14631f1ec---64079597431.pdf
    • https://al-wesam.com/userfiles/files/wazadakizenasof.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_off0000e6da.bin
e7e68af8f2c34724464ce1dffefe077dce656249beddf715d82ff867a3736799
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DA 10816 bytes
font_01_sfnt_off0000ffc2.bin
fa04353024d0eae2464cc3d048010166c7db35fba363ca5f0cc6653add2bdb1c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC2 16976 bytes
font_02_sfnt_off00012bcf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCF 16792 bytes