Malicious PDF — malware analysis report

Static analysis result for SHA-256 807a4e025d625a32…

MALICIOUS

PDF

86.1 KB Created: 2021-06-25 15:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe3e83dd0173a09b7c1dc36140cf8708 SHA-1: 439c115d854c18d2513f8572cc6bacef99ac689a SHA-256: 807a4e025d625a323211a334796bebb5bbb8e1a25ba8f9712caeb8576ba601b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple external URLs, many hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

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://powermailer.in/userfiles/file/54259820611.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/nj573lj2vc6sekqe2aepparp36/kofuxalozeje.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/d5e314aa6d292d01cd9eef78fa24f1bb/bovuzasow.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a10d079e---tatikojexupavev.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071a833e5374---bajumuvimijejin.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/a2nat2jpii9fte29htj4shuk3g/vebud.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/8422ea755750316e98f06776211ac906/kukewerevovolarazunavawo.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608210932cd19---dikoxutasarukazisomolesu.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/45768373169.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/fcc262b6f949bd5ca538df070649923f/gelovila.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/fh1lfh5e5v7vdg8b0ql3679q83/vuvunimaxego.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/24e4aacf9f0b614b6dbe4fb868655922/74842982991.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bcdbc1275---voxopumavebapidibivaxof.pdf
    • https://247hvac.ca/fabulous1/uploads/files/togupizezonisutezop.pdf
    • http://se-ty.ru/uploads/userfiles/file/1859691490.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e5926e8ba---26356241388.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad104ba91---vutuzafawef.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bbdfba8a0---52061477389.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=narcotic+that+starts+with+d
    • 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_off0000f14e.bin
bd3a2758a4dd2de2a6d6916417b3373f09f6c156c1920ead36114c2a6ed6a481
pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 10248 bytes
font_01_sfnt_off00010891.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10891 16792 bytes
font_02_sfnt_off000120a3.bin
6c38a2aca14323f9171cb9b27501ffca32e9328fab657bce45dab5cffd4f4209
pdf-font-stream PDF embedded font (sfnt) at offset 0x120A3 16556 bytes