Malicious PDF — malware analysis report

Static analysis result for SHA-256 82645261f79dc3c6…

MALICIOUS

PDF

67.5 KB Created: 2021-06-30 04:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b51b097a9a80f3dc775c2721368601d0 SHA-1: aeba5caa6b231be3bdebe5eed138c842c91a3ca2 SHA-256: 82645261f79dc3c6028e6f521091457944fe67be9753eda0f6ad4d72c16a6864
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 CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The file's structure as a link farm suggests it's part of a phishing campaign, aiming to lure victims through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160946ba2e4f64---81873307021.pdf
    • http://ok-poland.com/userfiles/file/46995435024.pdf
    • http://dynamic1984.com/user_file/file/bizamuwokopoti.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160872a90177cc---mosado.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/74a972d280a6c330d905f598b9a183c2/fixulubu.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da614534587---sunusetisipi.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831a01a09a7---xavupefanoririboke.pdf
    • http://elementsgogreen.com/userfiles/file/21090779118.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8a5ee02c3---favazasu.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7d0c7ac91---pebowikamedid.pdf
    • http://gocep.org/data/userfiles/files/80830530477.pdf
    • http://supermarketdv.ru/files/file/42737237718.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dec37ec49c60bd846b2787523cd0ca50/93877726273.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/c659af29868c9ab890cabefa30989cef/6913202832.pdf
    • http://ibtaker.ps/userfiles/file/xezowabigugukazexif.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cer44gpodmbmqns69d9cg1nvu6/79022171443.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792fdb6187a---36739676016.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/8fabc546baed1e1760a8821518b4adaf/menudi.pdf
    • http://proxima-design.cz/files/file/nivatapawusizedodif.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a707f652d44---11799725144.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=1+in+lb+to+nm
    • 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_off0000af3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3C 16792 bytes
font_01_sfnt_off0000c74e.bin
5cc2b74d11fc0920c0b13601f09896688a2b81eaf918f70fcedc35e113155f80
pdf-font-stream PDF embedded font (sfnt) at offset 0xC74E 14636 bytes
font_02_sfnt_off0000ec20.bin
09a62fbbcedf2cc2aafb660c9a1cbad1170904f1af44479de1c053c5865dcc4c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 9804 bytes