Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a92d11bdc49dfbf…

MALICIOUS

PDF

100.8 KB Created: 2021-06-28 08:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa19904e0f8cd3a9bdeee6a4e4d212b8 SHA-1: e6bfaa0a2fe9a7c05edbdbc02891c6a118a47f17 SHA-256: 1a92d11bdc49dfbf9666b4b88f8851984f805a5c2ce51995307ed5edf810e04d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://vickerycarpet.com/uploads/images//files/69745573241.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1e894c829---fosivizim.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a3575b1e67b9abc6d61b89334fb43b1/64973507819.pdf
    • http://minerva-collection.net/files/files/kizidemomajotaliki.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/an5b88t3j3s52cvknsptof0ei6/maminun.pdf
    • http://adamlegal.com/userfiles/file/84691641904.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607149bba934e---balipixuvufeditawoze.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/135bb08d490674ee25bcdd8b8b535d85/56567104572.pdf
    • http://musorcentrum.hu/files/article/file/fovugoripirafote.pdf
    • http://laweasy.kr/userfiles/file/73683284482.pdf
    • https://wickedcheesy.com/images/file/41397707814.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/fd424c4ff31dfaab591306026e2343d3/76296625009.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f75678a997---pekifevimoz.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090f957af112---fazaridajisusokuveferaw.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b86431f6d7---80225435033.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e1be6fb80be5d0840953980cfb0f39c3/26670214047.pdf
    • http://bocghebinhduong.com/media/ftp/file/jaselaxililidapasopo.pdf
    • http://chinhlytailieuluutru.com/media/ftp/file/pugewozexalemu.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/fdakp3gpaq72bia5lvdks3o4q7/7949679863.pdf
    • http://sieuthibongda.net/ckfinder/userfiles/files/ramajipajebesefi.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c37650879---32647207228.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=define+intrinsic+and+extrinsic+motivation
    • 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_off00012704.bin
7cbad03f6d33f06000a019595f5b6a95ced46f65cbdc5f887cdf73626d7d65c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12704 10760 bytes
font_01_sfnt_off00013fd4.bin
220c0f415cdf0467767e80620dc852af5db331fccdcb619f139eb33c821912dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD4 17524 bytes
font_02_sfnt_off00016dd8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16DD8 16792 bytes