Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb840ce8308d3f91…

MALICIOUS

PDF

102.6 KB Created: 2021-07-15 16:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f771b2530baccb41c522b975acc969f9 SHA-1: 3a8cb9b65a794cfff05c5f06c8a23b50742c2f40 SHA-256: eb840ce8308d3f9163e4fb1c69e0e213edc8c93ffb4e9989c33feedbb710d30c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the extensive use of external links points to an attempt to lead the user to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://philabc.ru/uplcv?utm_term=what+is+the+square+root+of+42.25 PDF link annotation
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd469e9173---47961645737.pdfIn PDF document text
    • http://prof-cosmetics.com/upload/files/pezuzusas.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41b8bf1230---labibiziwik.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/dbffdc1d494539591910d83d8e3a8b11/jazujosodoribiboja.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/dusabedifagu.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/9184375326.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/vp0v8un4b9nevisfdpdlga44he/39619164019.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/sukexa.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b31cd81e6---25346574262.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b63a788d33f---59327904540.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/91611345076.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/sixilinujemiwu.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/48193201446.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/9224018726.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/55r0bit7os8mknpj07ati14hs2/78177999644.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dab888344---63439900665.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883c6b0064f---36789957890.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e4ba98740ab---566004984.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/e58pposbtd4fiedmejd1pgf8bo/fabefipu.pdfIn PDF document text
    • http://skncn.com/u/files/95929234676.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cbc253002---lubux.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160d9abbc17cbb---navud.pdfIn PDF document text
    • http://446888.top/userfiles/file/24502024376.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca48ae0e2---52114266978.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/19754221709.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/65502181674.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_off00012822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12822 10800 bytes
SHA-256: c8d46532f6bf2617ad81723bd5b35d2c4a5064c9c8c813e73e662b699759a38e
font_01_sfnt_off00014154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14154 19660 bytes
SHA-256: a85542f82d0d52c51e81951297f83227dc6daa6958de7a9d860dde51468f4c7a
font_02_sfnt_off00017356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1