Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef779d4373d94d9…

MALICIOUS

PDF

81.1 KB Created: 2021-06-27 06:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2c63fbf5aa6641565b06136b4fd1c3b SHA-1: 34feb5eab34c098ad879be3e699970666b0bbd71 SHA-256: 0ef779d4373d94d914bc23c732bf580554990d2f937cbaec3c5e9a25fe57fd7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple external URLs, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely leading to a second-stage download or credential harvesting.

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://garglob.ru/uplcv?utm_term=paper+mario+and+the+thousand+year+door+emulator
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abeeea91c71---89773065433.pdf
    • http://aire-limpio.com/img/editor/file/4061587919.pdf
    • https://almuhja.ps/ckfinder/userfiles/files/25259824601.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/3cukifflf6lqacbr5ou833njmk/77319119828.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/47f18e3e8cc4cc0012d58db93d5eec12/52168460515.pdf
    • http://alibabashipping.com/userfiles/file/mutabolumev.pdf
    • http://pwmtqatar.net/userfiles/file/83554654549.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/39bd86b31b563439f742668aa6ecd68a/82002777567.pdf
    • http://sevimticaret.net/userfiles/file/90576636351.pdf
    • http://jinohair.com/upload/files/fifidakemasiw.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/g3cetvis2fu0km17dofhn5vl67/75928123972.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c91aa5e95e---wetedijabe.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f019ddb6ee---35592251685.pdf
    • http://hysansam.com/fckeditor/userfiles/image/92273394149.pdf
    • http://smflow.in/admin/uploads/file/jevafivowinal.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160716185b62a0---putunavabidofo.pdf
    • https://reniuved.it/file/mutelapugajaf.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ca5f8aa09f3927a8ce9ebaf5d504c7a5/46334638295.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/9ef29726323c19e507592892325e920b/luxitaxog.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c403560bb6a---tixegazitedepew.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_off0000d651.bin
e28b5f4481a3c4436edcf0bc7fff08b31dcc0c69de9c7a749c344c0d7ca42355
pdf-font-stream PDF embedded font (sfnt) at offset 0xD651 18392 bytes
font_01_sfnt_off00010468.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10468 16792 bytes
font_02_sfnt_off00011c7f.bin
f6458a3622da94a544e9d2e0e2492c2541ec51958211d1604a85defb2f4328de
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7F 10872 bytes