Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65eff6e7c241d50…

MALICIOUS

PDF

121.6 KB Created: 2021-06-26 16:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc41126596aac2e3b67fb97317359814 SHA-1: 91db09ef4ce1b7ecd78f002bdf95811580cf280f SHA-256: c65eff6e7c241d50076d7eba9f2548da9324cf16ee8ee85437ec32f46a052e23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host and distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or trojan delivery. Although no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2c295e469---81893924746.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092548127359---28039762010.pdf
    • http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/82226417695.pdf
    • https://alexandrapanayotou.com/web/images/static/file/filudiketobanoz.pdf
    • https://anmimar.com/royal/userfiles/file/21852591337.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b3ff32905---debore.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a84b9809baa---kobipoxusesekugorajuviz.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8dc210ab1---wojavoxegotekivagixa.pdf
    • http://anaminfo.com/attachfile/file/58065195818.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adec7e01b7---18615427211.pdf
    • https://betenrealestate.com/sites/default/files/file/tavotegaz.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ce79bf63d6d---kiboxesoxagonodaxibal.pdf
    • http://bestbuyfromindia.com/userfiles/file/pabegig.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/49561b7be70dbd8d9ff2b02bb80d8cde/rukib.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/aigme21vfs5gug59ba57t1ie7g/tasibi.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/daf4061fa26779e93f65ae6cd88df775/rudaxejivu.pdf
    • https://iwnta.com/userfiles/file/jesaporivebiralon.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9fc76cbe4---kidizadabama.pdf
    • https://ilmercatinosottocasa.com/file/24795315621.pdf
    • https://eobliecky.sk/userfiles/file/lizudafi.pdf
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/3764655d3d2780437f08ea0e35449c7c/rixamexozujeduwunube.pdf
    • http://staropolski.net/Upload/file/66275938853.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=university+past+papers+with+answers
    • 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_off00017bf8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17BF8 16792 bytes
font_01_sfnt_off0001940a.bin
0329b510652bb86f62d9ebe978036b9808a2726a48e468ac68009f2fc8c7486a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1940A 17140 bytes
font_02_sfnt_off0001c10f.bin
f584ea1d461fc29cf71eb7270fc42cbab751a636b61f4f73cf12405712894493
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C10F 10456 bytes