Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f04619ab021fe4…

MALICIOUS

PDF

73.6 KB Created: 2021-06-29 10:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7695053ecb3b930680016d94abac3024 SHA-1: 185ac826a7a8453bf15600d7f755aedc8806909a SHA-256: 83f04619ab021fe42f4e6fef833d6d393a0d90ea83e4845ebd2f5ec157de41f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, 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. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/ec141bd8e2e83244307472aeefb62e9f/vaveluxokuxolavobozupemis.pdf
    • http://anthonyvienna.com/sites/default/files/file/lakeretuxe.pdf
    • http://akcjonariusz.com/UserFiles/file/74273852923.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/btdlevkmjpa24m7ibg1v9be7f3/nakurunejidetuzeluzunixe.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/926b6b90e2e8d01ea2284c8ca0f5a917/84564715735.pdf
    • https://deltaguvenlik.net/userfiles/file/romavekaninawazijo.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160809cc5cbffa---10247217899.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770ef9d8c02---62194445185.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d9a024a2435cce20e32a8965c898671/kidus.pdf
    • https://clearpatth.com/userfiles/file/18960845870.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b545d153d50---pevujepero.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/d011lfgj5inko6avohs854j1m1/kavexif.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160b5ae9c4b0f9---pewafakexajilure.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/4ac2b159c0b7a1f19d2855b4884e9885/wanika.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/5oqq7uusg134ngn28mfdi4os5f/musete.pdf
    • https://hinodanang.com/uploads/image/files/duporexakiwezutowovoko.pdf
    • https://mdteam.se/ckfinder/userfiles/files/savexiv.pdf
    • http://dentalclinicbangalore.com/uploads/11181809538.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d1b25de1e---nidibesuwekizodi.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cdfa4b4f6---20542570928.pdf
    • http://robwalker.net/fckupload/file/ravigexajibatonag.pdf
    • https://elektrona.cz/files/file/tujafud.pdf
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/kurivafetema.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ug3mskc43joebkm423as8r2gm2/98969960819.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160850e5782335---butagajetifujatuvazuru.pdf
    • https://ka-base.no/images_content/file/54221917658.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=come+on+definition
    • 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_off0000c021.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC021 16792 bytes
font_01_sfnt_off0000d838.bin
5abaf41ed9f795104ae62d2e7ec52c895035412076ebd8852e71994f8ab13658
pdf-font-stream PDF embedded font (sfnt) at offset 0xD838 10068 bytes
font_02_sfnt_off0000ee97.bin
5ba5b2cb4bc484f5bfdbcfe5910c46dce5a7f400cad30fc8d323fae63395d94b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 16340 bytes