Malicious PDF — malware analysis report

Static analysis result for SHA-256 763142a182f1fef6…

MALICIOUS

PDF

89.1 KB Created: 2021-09-02 09:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0ea08bd3827d69aeafffb726eb418026 SHA-1: eff77d9bb0524b4e4e2a3b089b07c2c256926feb SHA-256: 763142a182f1fef6e13646b42407bbf057b8522f10b94942117f0ac7944fbd2f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. The heuristic firings indicate this PDF is a link farm designed to redirect users, likely to phishing sites or to download further malicious content. ClamAV detection and ML classification confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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=breed+rescues+near+me PDF link annotation
    • http://pwr-tech.ru/userfiles/file/64832784923.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/taneregosejezenefoxile.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/qgun44406mejrr0ej47m9e9uu5/81085381340.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d84ef2b66a---8054704838.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/4d2e19a8e3eb6424b48b8a0a30371710/joxadopeliwezufi.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/1417620487.pdfIn PDF document text
    • https://digireg.org/upload/53410046046.pdfIn PDF document text
    • https://khanikango.in/file/90749269963.pdfIn PDF document text
    • https://invest.pl/userfiles/file/nejezilujogajusukevor.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/86836170494.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086540858712---28895451270.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/kiroxaboxek.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/85597889618.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/bulirovetomefew.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609de49862372---wuxel.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/41791384238.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/k2g06i4f7hmc771ti02vh4ns0t/35636845838.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/19022699088.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/tujifovasatedurababa.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/56725067395.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1c54d09d46ca3294b24e89885b3cf6b0/bikubezutovedogafugutal.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBE 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_01_sfnt_off0000f693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF693 18908 bytes
SHA-256: 98837a28febfc76651b3d23d985aa493aca96ee4ac50b0fc3208c5bcf222e8b7
font_02_sfnt_off00012744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12744 10328 bytes
SHA-256: e303ef8337fc362bfab6877a79106d863d0226869458c975fa032b13edf6576e
font_03_sfnt_off00013e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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