Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a646b065e1a04f…

MALICIOUS

PDF

80.1 KB Created: 2021-08-24 02:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69f3309aac31131b2fbf7f34da774374 SHA-1: 689831f08d750f77b96421e8c31eedd77356361d SHA-256: e5a646b065e1a04f60be00dfd5ce474ceb4a1b91d728c5409759977563f8123f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to malicious sites. The presence of these links and the overall structure suggest an attempt to lure users into clicking through to a compromised or malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://partnermind.cz/images/files/58383548843.pdf In PDF document text
    • http://beerskiboot.com/img/upload/file/dazixasena.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/davabovitup.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6258fd099d---85486050532.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/zivotewi.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/deff317b1314b2900c301f89a6a28dff/suxolugixozap.pdfIn PDF document text
    • http://yjccnc.com/upload/files/75573816813.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/giximaxinadamofonagibe.pdfIn PDF document text
    • http://crm333.com/documentos/file/faketetogupadikug.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/60723048357.pdfIn PDF document text
    • http://drironcat.com/images/file/35606531654.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/91064404896.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/569ad0406ae1afb9dcebeb8f0192391b/redobawapisigokusajixa.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607063f986a08---55920780549.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/gowotap.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/43805849300.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f2f403068---xamagodomojigutema.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/b3b028e6fd64145e1882906b12d35831/jotezoxevuduzop.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/7103946434.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/41386640410.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/66030187925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=your+heart%27s+desire+numberPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/waruxoxawekejegesusew.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_off0000d7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BC 16264 bytes
SHA-256: 952995c2f1c741fb4e5528cf7055b807312f853b9c9822d3b436474abb07e6d6
font_01_sfnt_off00010218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2F 10724 bytes
SHA-256: ea84be11f922a91cb49eee8f8b15031829141c44f2dbe581b4c8e94155f12c85