Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae64bcc0e9c66f3…

MALICIOUS

PDF

90.0 KB Created: 2021-07-31 21:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 99a0d6cafb0bf6aa504b47272ecf9e1e SHA-1: 04d9b3618d86f829583ecf8b97a2a8d8bafcccbe SHA-256: dae64bcc0e9c66f3562f0b440ae1ad09f61633458944150c83efc43d4a5b9739
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ade1780548a---79969277167.pdf In PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/b2dcada1f754545df0c2d1da43531578/dagesavesu.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/61765134117.pdfIn PDF document text
    • http://salkim.com/userfiles/file/xupadopazelorazoka.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/bababikenidowavuxokifare.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/1018187205.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089db40b7257---duxelaxokuxinojojikebus.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/vuwutepasezuvad.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607125592397e---78240581142.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0623201d9---gogijaxesinajon.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4a82d34eb---74119272153.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a3dab24baa366c83ef2aef3896719091/66645321858.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/rerokeb.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/segulugewo.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/99801971006.pdfIn PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/xiviwakamulotitotivug.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/rasikunutasaruroj.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/jijipejenigetafisu.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/9085934790.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/bunebagurazatamalogirem.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4a66f5168ee5f7184970ce90592edf22/wajowepizoma.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16105225d0a291---zujotiwoned.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=utilisation+de+l%27alcool+de+menthePDF link annotation
    • 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_off0000f7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BD 10576 bytes
SHA-256: fa44ab6f22995c4b9e747a2e64351f85570cc794385b90a94aeaad9c39c8b98f
font_01_sfnt_off00010fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB0 19048 bytes
SHA-256: 0954d63c4ce7b7b39781072ad437a144ff8c30163049453b8d1c26662c41374a
font_02_sfnt_off00013f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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