Malicious PDF — malware analysis report

Static analysis result for SHA-256 4256229bb3c61cd0…

MALICIOUS

PDF

83.3 KB Created: 2021-06-25 14:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfd62ab7292b451ee4fbf47ce5b61d37 SHA-1: 74567d04fd7104f65fae04171dc231510bbf8161 SHA-256: 4256229bb3c61cd01912b592dc7c3066c6fe9f708f6047a6ae3668744533ef16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to other PDF files hosted on compromised websites. The heuristics indicate a link farm on disposable hosting and compromised CMS upload storage, suggesting a malicious intent to distribute further malicious content or engage in SEO poisoning. The ML classifier and ClamAV detection strongly support its malicious nature.

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 https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/vt8o6i1apbq4rj23iqt8mejkea/wuxasivobiwubulev.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba159a1d97---gaxizetonovunowikenag.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-19/20210519122401803664.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/039ff620fe36cc7e482cac16ece155cd/depusufidovogapix.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d4d87e55a---fexagomakuropiginabezeg.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/subuvajegonesiman.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/3f2baa5f7a0f292f351fe95f26dae55d/vonuzepamilefunumep.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d37b5c7dbc0---54630603340.pdf
    • http://bygreenpure.com/userfiles/file/nufigetovabagidigax.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/dce0637d445243d41263a3c07f84ead0/seziluxawut.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ab203c74ae3b447c24f7c7b3fab3bbf5/68919424432.pdf
    • https://allcreaturesinc.com/files/files/71526033232.pdf
    • https://wemservice.com/ckfinder/userfiles/files/rifolezokeli.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb62622963---terojevakeliwifemanal.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/2a35bd3fb742c9c5af6f438f0612f18e/fipukovolugujuwolive.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+free+video+editors+for+pc
    • 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_off0000e5f3.bin
76e31684eb3708d336c7bfccae0004b77e89727efb3a9abf7b193a9e02538c00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 10420 bytes
font_01_sfnt_off0000fdbf.bin
67252ffcf75ab9b1523adca09dfae119037ef1d761cae59b767e8301ff94f703		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBF 16600 bytes
font_02_sfnt_off000128c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128C5 16792 bytes

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