Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c35130ec5ca228…

MALICIOUS

PDF

75.5 KB Created: 2021-09-16 20:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a0a0e573f15105b4875eada72e140b13 SHA-1: 19be44c30ee891dd141e2e6fb516e73f55b88747 SHA-256: 29c35130ec5ca228d7b57e5d5ae73fef4cc677f591110f8f57c556d194121828
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics (link farm, compromised CMS upload) point towards an attack pattern focused on redirecting users to malicious sites, likely for credential harvesting or to serve further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://smidgel.ru/uplcv?utm_term=griffiths+introduction+to+quantum+mechanics+3rd+edition+pdf PDF link annotation
    • http://leebyunghun.org/new/upload/board/files/54074440079.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/95791233728.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132dec918898---2593685225.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/pufetogimo.pdfIn PDF document text
    • http://semanbio.com/upload/files/jipukosebuderanidurewepi.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/50939767130.pdfIn PDF document text
    • http://btfa.tw/upload/files/6569820788.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16130b6b7981b5---lilalet.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/19467456810.pdfIn PDF document text
    • http://futboltotal.net/images/files/bosorowivolakod.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/99478050540.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/23277921018.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc3c361dc1---51495836916.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/ruzilaxaxani.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90493254504.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/44417731955.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/51978779198.pdfIn PDF document text
    • http://finchamauto.com/pics/joponixajuxakebigupu.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/xidakunagurewisezuwuva.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/72287116337.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/db07feec8a0ec80ea3461fa2fb33b20f/ramologakadivesevatojum.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161363ba4bd8b1---71731605740.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/gotopanudepofew.pdfIn PDF document text
    • http://hydrem.ru/images/file/86647473506.pdfIn PDF document text
    • https://citytrafik.nu/images/file/38466599254.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/phtvt6lv9hm6v3u3c2fge7tiqm/61862480251.pdfIn PDF document text
    • http://wmsone.com/eimages/file/86288800289.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/50755060616.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_off0000c251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC251 11296 bytes
SHA-256: 1a07ce857e37202850457c305e7d3ec59b27f5416d704b5234f736de3101bf0e
font_01_sfnt_off0000dc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC83 16760 bytes
SHA-256: 0a6ac8892da2a20029fd80a371f7506a1f38050a235d7e5f3c9772d002b88b3c
font_02_sfnt_off00010776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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