Malicious PDF — malware analysis report

Static analysis result for SHA-256 edce10e4270c437f…

MALICIOUS

PDF

76.5 KB Created: 2021-06-14 01:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c063c71f084e2a4961c671998dbe84e SHA-1: 26abd7c34ed5bbc29a7a8d7be9d89d670dd912a8 SHA-256: edce10e4270c437f5521854dbbdd87f8e4cd2566bf0f831ad035fbe07d753b5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. 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 a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://catamma.ru/uplcv?utm_term=present+simple+explanation+and+exercises
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/qcv086rkc5jdb9mm9g19apnpjb/ludoroxefutewivajika.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a17f4c3d157309b44659753d0470a7c2/vuxutemijemogixaruxus.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/93d7b778832a04243233967e8809004b/dabukowerimivaz.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a29177536---50772077917.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/2a583bde44e67cad3c335449c7c12295/wigugeduvaxu.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3e708b119---21294934825.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/bac86pdeft0tonhl68h8ci2kc6/bedujor.pdf
    • https://waelfawzy.com/userfiles/file/
    • https://gilbertems.com/videos/file/44181500222.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/4096003d59fd73ac13a22ede5c713af8/67261288038.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/l1fg57r5k4pkvcc3lsjrr36hbn/34671166175.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8806c51ba1---43359278535.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086ddb645cdf---woropige.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16094021deb9fd---tadixizuser.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f3d701e9e---napodurowojabusuruzidis.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/ladaw.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a213858c4c9---kobewusomekitodogidif.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab95024f74---10914980784.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec9c.bin
2fffabebbfef039d53e8559f6e026d3d7ccba1d2275e9f085061072ab589791d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 5288 bytes
font_01_sfnt_off0000fe84.bin
da2d06098365e6cd155dda54bb2d3bf5944a5980eca2a8d00ffa604d25d7c985		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE84 11552 bytes

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