Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ec65fe5929da80…

MALICIOUS

PDF

87.0 KB Created: 2021-08-05 21:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c08c938fa368d28053d86b37b0b871d4 SHA-1: 92f9c47b13628cf3f1e2042f1995ec00e16a2daf SHA-256: d2ec65fe5929da80b34031f004dd24f41b3163a5c55bba73dfc8538ad621989c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm for malware distribution or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a social engineering attack, likely a phishing lure disguised as a job-related document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zomepujoxamat.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d82f789720c---27310496309.pdf
    • https://tanthuantelecom.com/upload/fck/file/96575015235.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/406a48b97706763317e6c1db53b80c52/kukaxoros.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/8q659830d78g4s9250319l2kfm/rifexuxaniborepivasowo.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c623e6c0bf4---kuxufogu.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5ba0e1a59---67412291395.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160edfbaf9c748---44042961005.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/0c64f92035a7fb2d55d244b67da6e5d7/49100890625.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ed63ac5cc---6357670746.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b64cafa3399---muboginumanel.pdf
    • https://istocdukkan.com/userfiles/files/32459401472.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160968fb2b428c---12480424543.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e08d5db59e8---petuwojoxulagapuwolenomo.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/6e00d7253cb66a03b9519cddcd897083/71072600955.pdf
    • https://careersourcechipola.com/files/public/81302565665.pdf
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/8554484662.pdf
    • http://detskypohar.cz/upload/file/tivavavokakirig.pdf
    • http://muszempilla.com/files/file/21694079606.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/b3abbd3c044e666c2a404b3648c8ab78/favejogira.pdf
    • http://indel.sk/userfiles/file/43246369355.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=job+resignation+letter+sample+word
    • 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_off0000efc9.bin
7ccda70bd512c779e599610873709cffd7a4207ba0f63c4a05004ea2ebcc4cf2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 17540 bytes
font_01_sfnt_off00011d1f.bin
78ad45c99a61d4ef8de197272560116ed69a65ef45ae646ea28a4d3a326bf181
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1F 10952 bytes
font_02_sfnt_off00013629.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13629 16792 bytes