Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd8083f63ab2b4c…

MALICIOUS

PDF

99.3 KB Created: 2021-07-31 17:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b6fa2d5886260e127e2ab7490002a7b SHA-1: 64b5bdfc0031c5757165192dedf5ab87d233951f SHA-256: cbd8083f63ab2b4cf3819b5b6ee22d9a3887ddcc9152f01aedab5852f55c4e5f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing or malware distribution. No scripts were extracted, but the presence of external URIs and compromised CMS upload links points to a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/2c6fb214ce62cf1779c6ab4e3d4d0fe6/susomonaperatekufo.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/c5531e384bac9401913c84c22cc1e126/tevinofupenuwodidukifig.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a05936cfef---xozilijopoguwela.pdf
    • https://energooptima.hu/upload/File/xemisegeneroma.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/deturajator.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b38535e605---12159876238.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085aaa4a1543---89675329813.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d88506901ff---20619385193.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7899cfd6b---79854172606.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/28cd79a070bd16792617272eea064cf1/morugidubefu.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d738a64ce---wobuluk.pdf
    • http://airconbank.com/upload/fckeditor/file/zimavogiv.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/c9cc4146b0577a53123f7c128ad70191/bufefi.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/gavidbkpq4rofl55lr9vo05rb1/26731559945.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/gt5353iuef7gan884i111ta9fs/futotetejomemawagor.pdf
    • http://moiarchitekci.pl/pliki/file/60533856807.pdf
    • http://autoscuolepintozzi.it/userfiles/files/85910529278.pdf
    • http://oreade-breche.fr/userfiles/file/63625000529.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160764ad9e9f24---zugoludubevadezevisoji.pdf
    • https://rubenoferro.com/userfiles/file/87878848284.pdf
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/15701499412.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/8bmobqkkvu6c17ms0cf11mta09/lokeko.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607411e118703---69941725780.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/5e794b63a7a7c7a929b3c5b0efeb74b9/mufurezeguweb.pdf
    • http://dentalcenterstudio.it/userfiles/files/rujof.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=problemas+con+notaci%C3%B3n+cient%C3%ADfica+ejercicios+resueltos+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_off000117f7.bin
29c1d7be4e9c7e0e2d85175051d7bd60aa5ba585e7336142df9f27cba94f9893		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117F7 19240 bytes
font_01_sfnt_off000148c1.bin
16c63759fd584252fe08792d63ddd5b99d51164a75075ccd0a45e4e6c857973b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148C1 11352 bytes
font_02_sfnt_off000162e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x162E3 16792 bytes

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