Malicious PDF — malware analysis report

Static analysis result for SHA-256 2352bc3d777940cb…

MALICIOUS

PDF

72.3 KB Created: 2021-09-17 03:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c4888977308ac1830e931b6ea0eb273f SHA-1: c092db883f755cccf6da3fa9a48f495e2b5e80d5 SHA-256: 2352bc3d777940cb931468a7adb0dad4cb7ff43414c61f3d2289d3c403283f9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised or disposable hosting, indicative of a phishing or malware distribution scheme. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=fake+front+camera+android PDF link annotation
    • http://mu-rrrc.com/userfiles/file/mimejiwukututikokip.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/verawekojudipidowuriwo.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/nulas.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/sivogoleritizevinawu.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/mexalatapevejafejiv.pdfIn PDF document text
    • http://silver1979.com/upload/file/90524023573.pdfIn PDF document text
    • http://hkalc.com/userfiles/37259019932.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614251c6e157b---63533207283.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/57977253504.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e23974b80d---nemopik.pdfIn PDF document text
    • https://phunhai.net/upload/files/luvup.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/gipofefev.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a35360a3---gagumajegevodidujiwuri.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/55131087590.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/vovenepakifaviwiz.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed8af61e63---voxiwu.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/bomutikezakap.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/zazadeguxenedojuduve.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130816398897---45704272740.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/ludogipowopazidobadu.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/72180227911.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/75140954691.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/tiwuvifusizuxub.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/fijejurofofurugixenepu.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_off0000bafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFD 15784 bytes
SHA-256: 8b3ffa96ed8908567ed9514eddac228ccbcad84811cf291c1ae7e5ae1b1feeab
font_01_sfnt_off0000e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9F 10492 bytes
SHA-256: 9df51d574e0e2598a4202cd7f05af484bbd0299aeff92fa68868f72326973cc3

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