Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb34092273fac4d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 18:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d62dd59bdc57662a9ebbd707094a3db SHA-1: 779a3c32817d8481e7923d4109671b503a062304 SHA-256: 7fb34092273fac4d6cace7b5d534d1c14243a62c0550842eecb62742eff86f5c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm. These links are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=code+call+of+duty+black+ops+2+ps3 PDF link annotation
    • http://ecohort.com/userfiles/files/wabezorururexa.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/fadabuf.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/wibasivilakobiko.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389cb480ed3---61546171361.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/moduvubotusipowoximo.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143b63d0e855---75748896733.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/48654703046.pdfIn PDF document text
    • https://soechi.com/userfiles/file/66826308647.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/rovokizivokinilek.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/892518b0f84fd175e6c96292621a6590/31182284887.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dc5596b98---8271091173.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/nobome.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/lamolagovuv.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/bupunurodin.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a95bf50419---daluban.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/93837323504.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuguxobinaverabog.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210904073040.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109090424034312.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/dobovox.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/3031ff241a4a80b3f7073bc3fad9e401/povowibesodovolasarav.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/19249317301.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210914105042_736891.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/85109283443.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/5812450756.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_off0000dcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCE 18776 bytes
SHA-256: 7fdb35496ff3eb19c3e6bad34d1ae67078dc59b12b59098e522e3b6fce40d483
font_01_sfnt_off00010d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12532 11084 bytes
SHA-256: eee361124c0ec8ab4fea55a3d7505376b179d27475275434c289aeafbc5be8ba

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