Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa99647f2fe29783…

MALICIOUS

PDF

82.3 KB Created: 2021-06-25 13:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19de27555da0432b6d7a83b01720c6de SHA-1: ab5facaf793c0473ace340f63a6ee1a74c344247 SHA-256: fa99647f2fe297831560cc7ebdc3343760b5ce1f6f693ebc1300e80c13c18c99
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the heuristic firings and extensive URL list are sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=name+of+caves
    • http://guowangcable.com/d/files/wejibuwe.pdf
    • http://digifast.cz/userfiles/46542991305.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/02ee7d5b1bfb24d7dd71bd323db918da/38142138486.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/877185089ec21627a8d65d44fa9cce48/71917961927.pdf
    • http://kovacsoltvaskerites.hu/images/file/26375945335.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a594f8edc5e---10568204256.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1b77890638e1c8f74cf7be534696184f/bajuxojigujawogusanef.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084d7e690106---42414974824.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093e772cd4af---navurusufiz.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9841a0c0b53e61523a2293c00efb2065/pasutiponodekebetifiju.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/9f700e23a16a7abc5398b49db4e53caf/81225614599.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607111474bde3---81450748461.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607424dca4f6c---78709633975.pdf
    • https://rybczewice.pl/userfiles/file/90176089559.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_off0000e0b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B8 16792 bytes
font_01_sfnt_off0000f8ca.bin
a4a668ef4d02059cc5ffdbc8725455c3004033adcc9bee1874aff7f66ebb7c47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 16876 bytes
font_02_sfnt_off000124cb.bin
8dc7bef3aedfd1e8d7745f1f67d8c40eb4d688bacee6882fbbb8a87bd1b22b12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124CB 10100 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.