Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f9f0e6e057d745…

MALICIOUS

PDF

78.5 KB Created: 2021-06-27 16:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92e79a1f86fdf9ce9e3839e8161607b0 SHA-1: 3bcbac50fbb981311846edb7b7a1ec208c810e66 SHA-256: 98f9f0e6e057d7454e539e32dbe58067676a9cb3fd54555b473e301968d108e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The primary attack pattern involves leveraging these external links to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cructi.ru/uplcv?utm_term=meiosis+1+is+reductional+division+meiosis+2+is+equational+division+due+to
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/305571a7e23ff3d6aa3533c8c952f86d/10861726309.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/5049a3dai45a5o757mknv4c9n9/jurofawipuguvaxu.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d29208a6062---vakomibosudejatakaniru.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/8310bf958ea7d9c18ccc65eb2f162acf/91481273007.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886a539bf70---kinitotajinixudodejawesi.pdf
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/jovameles.pdf
    • http://scro.ru/pic/file/gisofeturagirefebozesuma.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab79a252b4---25729384191.pdf
    • http://mu-rrrc.com/userfiles/file/pekufutowef.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d1a7c220e---50211323285.pdf
    • http://atut-biuro.com/uploaded/file/57493496385.pdf
    • http://tamker.hu/userfiles/file/40217535964.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089405d0c6cc---sokaponak.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d8b02a00fd8ddafeab1dee2716d53181/8945150793.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d311eb4c12---57263270880.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607693c35b0cb---18159059617.pdf
    • http://katyababash.com/images/uploads/file/63733788569.pdf
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/rogojutuwufevifimu.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6387e54b---98569993229.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/da649bc28c6d6e8c5a663a3338e5501a/60152116234.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c442b2ae285---lokod.pdf
    • https://ivanda-commerce.hr/userfiles/file/51206845415.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/61e65f58d7d0173ba3975564be02d608/96537931080.pdf
    • https://ukmalayalamnews.com/userfiles/file/76324248494.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_off0000cb99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB99 16792 bytes
font_01_sfnt_off0000e3ab.bin
ec1f27e9cb2371b23c3890b4b1b7aa1ad2982eaf028d88167a1b3780342908e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AB 17436 bytes
font_02_sfnt_off00011075.bin
6675ec1a7cdb81fb9857256d99c1c39298cec94624cf2fd67c255f17194c1553		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11075 11008 bytes

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