Malicious PDF — malware analysis report

Static analysis result for SHA-256 41027e019fee59e4…

MALICIOUS

PDF

74.6 KB Created: 2021-08-10 02:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 114c33bfe941f8026a9e6bcc53544020 SHA-1: 53e36126224cdf7158901afd008cf2d856c0743f SHA-256: 41027e019fee59e48b96bee2cf9c454585d25d38f5266bd86794b28d8e2263e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://drafthe.ru/uplcv?utm_term=what+are+the+qualities+of+useful+information PDF link annotation
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731fe70c6ff---77151780387.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/momunokivufimegijuzigu.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/16556511832.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/32436012159.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/pumuxefofijugiridedur.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/94615378496.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/77316911697.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/vugodawuxudimuvemu.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bbffd69cb87---jawenadisowoxid.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/68815485054.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/31658568872.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b45e6304a---27523232295.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/13534172868.pdfIn PDF document text
    • http://midel.me/userfiles/file/83998653158.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/dce13npo3l0dpcclpb3uomdgtq/96960426050.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/d8374586d1eaa3ab959312dce6af095b/20068741166.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210529171205.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/98486063515.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3db987b32---gatopemimixofinasokidim.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/94868744084.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/35750099004.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b205557d9e8---2982812389.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160799b3d7c964---dibexonoluwanagimilajiw.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/denuburezozamuvulusejaro.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/6rd0kftjj1an7kp8gi3pt983nk/gubexamipiwewijipilek.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D5 15784 bytes
SHA-256: b590d5422fd4cdd2340bd8ab1722a867b3b17966dd83eb571493e3401cf114e7
font_01_sfnt_off0000eb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB36 10716 bytes
SHA-256: c4c0d1fc11f9d3232a716d1dbbfc243b823c3732501618ada7672b5a0e8084ca
font_02_sfnt_off000103a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1