Malicious PDF — malware analysis report

Static analysis result for SHA-256 da05f9b345df76d8…

MALICIOUS

PDF

141.6 KB Created: 2021-07-05 06:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4973c4e1dfb952d3f1374ff0f03de216 SHA-1: 96667e4263b948395de7017310edf082f57303fb SHA-256: da05f9b345df76d8767f889368feacad96ee74eaa41a40c57f7aef827df4c6db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the attack pattern of directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://huntic.ru/uplcv?utm_term=the+language+of+flowers+pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0ede2207d---perozuviwomadidot.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/edvndivsv1akjkqr3c04mtkhi0/fezagine.pdf
    • http://sevimticaret.net/userfiles/file/togufisimukuzib.pdf
    • http://barrybusiness-crm.com/ressource/devis-photo/files/vikiziterawisiwidavab.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/8644bc3570ddfe23ff5d170259b8b4f5/vapunenawafunor.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba79696947b---sopomagukuxozobum.pdf
    • http://nationshield.ae/userfiles/files/69894517253.pdf
    • https://cristalensi.com/public/File/60858912318.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0808228a04---160141092.pdf
    • http://muszempilla.com/files/file/81586709733.pdf
    • http://mexvp.com/ckfinder/userfiles/files/mituzivodurasotibomawo.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b377580bc---15677581060.pdf
    • https://camping-du-lac-dijon.com/fichiers/77518825512.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16098ae5d02088---31432879214.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160d374094c322---53158156213.pdf
    • http://starwindows.ie/ckfinder/userfiles/files/90797320972.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5b06f20fb356ae7d12102faeea6cfb08/53758723445.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e80f60da68---rutevorida.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090977a8fcb6---37683244157.pdf
    • http://vimar.ua/userfiles/files/74321826500.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2e5a0fb8d---99238825397.pdf
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/7425124677.pdf
    • 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_off0001c731.bin
1a48634f15c8634dd2d0321b2c8bdbbbd20496889a658c67cb1cc51656767063
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C731 10736 bytes
font_01_sfnt_off0001dfa8.bin
fea4a39d71cae4c223d8d5f6422c0395d247777a87167f0b97d3052e3a8183c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFA8 18416 bytes
font_02_sfnt_off00020f32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x20F32 16792 bytes