Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba85257c77c73ef…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 16:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e0b80a48114cc08a95be7baf22bad7c SHA-1: 1695cf8e0978f86f41b7923dac7a92826d19dcd4 SHA-256: 6ba85257c77c73ef34798e905215930114aa21077d6ed56391c44c7729c7c9fb
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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 http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/92751799413.pdf In PDF document text
    • http://fkhd.cz/data/img/dudojifawataleget.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/75415172540.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/72259007125.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/65626780961.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/40255417037.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f8913889947---81419456256.pdfIn PDF document text
    • http://classtool.info/upload/files/jitiseku.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/fc03d7a86f0133885590d900391bb86f/13552559935.pdfIn PDF document text
    • https://srmresidences.com/images/bulk_images/files/88907782493.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/21415768904.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/qu5dcfc5c281j52qqof2t9e06f/16218527339.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078d812033f6---xutasivufofe.pdfIn PDF document text
    • https://hgb.se/filer/file/mofip.pdfIn PDF document text
    • http://kingnature.ru/files/files/kebunuxosewovibenibe.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a5f6b30f9---bovidapewuxudit.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2895fc0d78---filedomedoromakaxojiwe.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/lofamuxotezavafinidajevi.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/95844592092.pdfIn PDF document text
    • http://talleresjpg.es/img/file/kepavetutobaxej.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/39680416596.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/95482629062.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/9860870424.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/30846283664.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/satupabukuvakisoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+system+of+nature+pdfPDF link annotation
    • https://lapdonline.org/file/47193647600.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://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_off0000df57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 17128 bytes
SHA-256: 56afda78c7a5b0f1f0235c2d14c00e10d41d2e17fbeb8643a0049d6d968c7273
font_01_sfnt_off00010b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B06 10800 bytes
SHA-256: e4f6c04e3bf4d37d036d256c79c56ccb0f486276522b3a7ceb510bdd18a67a9d
font_02_sfnt_off000123ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1