Malicious PDF — malware analysis report

Static analysis result for SHA-256 c785aef0e42e0f1d…

MALICIOUS

PDF

87.4 KB Created: 2021-07-21 17:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c33f45623ba106a70cc52d3ae280a591 SHA-1: 020a5e69ca0b0e0f82066fc8234d76ab0a99b1e1 SHA-256: c785aef0e42e0f1d03f227588a1f519e903de5c10eaac47e3ccc60203cc3f18b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf08f484de0---16738483669.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/ebde46d1cb999680152b98660da867d7/85257443740.pdf
    • http://dobrasekacka.cz/userfiles/file/66622195797.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/a4r2e3o57hn6kfhd5u2tpjbrvr/kexoxiridamozete.pdf
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/96943252532.pdf
    • http://global-leasing-management.com/uf/file/jimadisusolononuzelodoke.pdf
    • http://www.blueoak.fr/image/file/tebutogirikinodubawuxapu.pdf
    • http://dighakanchaninternational.com/FCKeditor/file/bewejalezogukenizuxe.pdf
    • http://akicgiyim.com/userfiles/file/bivimol.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/gtdm3am0v78pcla9aum888kniu/13442545104.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/9tdn830udm8a50kjsm1mq2r76i/bubosivezeterap.pdf
    • http://hkt-optics.com/hkt/images/userfiles/file/wadevuvizulakizezisu.pdf
    • https://lawyerupsmart.com/tempimg/file/wonufixupumewazelinuxa.pdf
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/33180436855.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10df7db07f---vaxoj.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/10f460a9f8953348aa058aabba571cce/17641043564.pdf
    • http://mhinflatable.com/upload/file/gakomi.pdf
    • http://geoplan.su/userfiles/file/24831183050.pdf
    • http://www.gabrielamaciel.net/images/content/file/worulopatobowemob.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/niqqnj1qlfhrkndh8kiuqmotu7/zewufev.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16072fe86b3744---11429146391.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160d2026b4fa59---tewavatapigirad.pdf
    • http://cainghienbinhduong.com/uploads/userfiles/file/31056951958.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/dd9ec202f60af4beb53106dd35aefd90/17997725490.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=manual+of+nursing+procedures+and+practice+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_off0000f350.bin
4a8ef7f7e46b67ee5c90b4978f6a186f80f205935bf11ab66bc67ecce994ba2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 16564 bytes
font_01_sfnt_off00011dd0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD0 16792 bytes
font_02_sfnt_off000135e7.bin
f3a2673b26fdfefbb8469588687a37266a8328853a7f718e1ad3940848ee8619
pdf-font-stream PDF embedded font (sfnt) at offset 0x135E7 10888 bytes