Malicious PDF — malware analysis report

Static analysis result for SHA-256 4336ead19bdaf2bc…

MALICIOUS

PDF

88.4 KB Created: 2021-08-10 09:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fbae1f356dfda20f6fb003d6b77503ac SHA-1: 52e8d8df802d8369a65afc47dea119f095afbb88 SHA-256: 4336ead19bdaf2bc46f0d50de15dd335d740786951fcd6e18d86a19bb99f80ed
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing and malware distribution lure. It contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a fake browser update or extension, a common method for delivering malware or stealing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://crewmak.ru/uplcv?utm_term=cool+hd+images+for+whatsapp+dp PDF link annotation
    • http://kartywspomnien.pl/uploads/assets/file/28576376971.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/59537829518.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160edbea1b6fa5---wujimasenurumeruto.pdfIn PDF document text
    • https://eslms.com/userfiles/file/52171184933.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/6770022605.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/94039603294.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/zemujuwurapa.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bcc6bdcbb---fekogo.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161097c2398475---gonigogorijan.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/72199648419.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/ribefateziwujogafizabezu.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3cebbbaba---91146364946.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b17221627b7---51349716106.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/4877104970.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/52389548518.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/36383155300.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a90461bd9d---13265808553.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089863f76fd2---vabovamufumekozawiru.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/zezulowujajebidif.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/gitowenujopojupopi.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/kopixamomata.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/65004862398.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_off0000f2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B04 17964 bytes
SHA-256: 2aab574000df734c29e2019ca6e9ba275112beb4b2f2cfb6316167fa79e184a3
font_02_sfnt_off000139ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AB 10960 bytes
SHA-256: 6a6cbe3afc0ae0241d7a6581354b3d8ba2983745a2e79e9c644d50ea6cfe7d83

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