Malicious PDF — malware analysis report

Static analysis result for SHA-256 905b1bb1c2f5c05f…

MALICIOUS

PDF

81.2 KB Created: 2021-06-29 03:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c58fbf81bc40ade060566cc14dc5a39 SHA-1: 18b8ada14b362e577d4c215a9cc1be6c0335b5e5 SHA-256: 905b1bb1c2f5c05f7c9f532b0fa4f63814d0d8c179e263edb969486f8b8eba9f
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the PDF structure and URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://lungshingcentre.com/userfiles/mosewarilupotarekuvatiko.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7e08aed5a---45915765185.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d1e7e26f5---kubew.pdf
    • http://abwrichmond.com/uploads/files/lelodidew.pdf
    • https://natyabio.com/uploadfiles/13622519263.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/b29fliulhe9sbqi9o1jghvecgd/potowoxavivalonazizin.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b9133af0045---rekewuzeveladozatuzexufi.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac40e6a6eda---68659959874.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3745191fd7---53382888107.pdf
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/babafexu.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/b559a527d45f0e12ad493a961228e52e/44928312840.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609d43f4197ba---defixurikejuv.pdf
    • https://nguoixunghekiev.vn/userfiles/file/gopemetofiwewijumevirofij.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867bf622626---33068502306.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53059a8bf4---berubeliwexozeg.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/2c5e914f9fce56367e5bd9c063d15590/wogivubiponajikiz.pdf
    • http://aven.su/userfiles/file/kufepun.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767b6f779ab---noxoxufuzola.pdf
    • http://tovicetour.com/FileData/ckfinder/files/20210607_5A353F698EAE9737.pdf
    • http://nail-free.com/ckfinder/userfiles/files/25582853070.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/82071276730.pdf
    • https://cihangirhotel.com/upload/ckfinder/files/89476968432.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/5ae019eab51a4146059538a3c3a3aac7/12539694660.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/db5330f76b6c962ddbec785c1099ca98/59324206716.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=army+sick+call+slip+example
    • 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_off0000dd0c.bin
5c3499d2488f7598505720f7291ec8c4661d0cb05de5512df765aa379d7d9bff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0C 16408 bytes
font_01_sfnt_off000107b4.bin
b749213a1a432033a5940716ebe6556ce99939c900eb1c67a3bc3bed6e4cc6a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107B4 10500 bytes
font_02_sfnt_off00011faa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 16792 bytes

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