Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d55b295c8437f55…

MALICIOUS

PDF

84.1 KB Created: 2021-06-25 17:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92c872fc371aebf5ea781354ddfbf0b6 SHA-1: abd3cb5104923ac52846251b5c74f271576227a5 SHA-256: 6d55b295c8437f55de2928b0e72893068f3d23b8fd708d0177624fb387ce9f9f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://msamericapageant.com/clients/873634/File/21115797091.pdf
    • https://prosperitas.be/data/assets/file/33584509018.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acaa7fe4c59---kakijufajewakoxilulesapi.pdf
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/33999139987.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c43dced165---vijagunaripanomobo.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9784ad31fd---8878447064.pdf
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/38910530808.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/ff28cf0471fd20c2b44914b2c9eae34a/tovumudonurudilikel.pdf
    • https://asiquim.com/ckfinder/userfiles/files/51448379992.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/53345104588.pdf
    • http://xsjprinter.com/d/files/68169604375.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/fokdjmr32c910u7cv89ft0rrg5/namokekemikil.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a032d6994c0---nodifojowaronanebesuv.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16077973cb313b---nedugukuta.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=unsolved+problems+in+mathematics+pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b989897cbcc35d70e4c00cbb322ebe72/8297136075.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_off0000e76b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 16792 bytes
font_01_sfnt_off0000ff7d.bin
884c3a2b5cf651ef8d2867f9ccd9a0da511a8702e05b252d9e0a689441ef90d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7D 16884 bytes
font_02_sfnt_off00012b7b.bin
60586e596c9a9c0e7758d358982632b6e53291695234c104014faaa27c0018c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7B 11100 bytes

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