Malicious PDF — malware analysis report

Static analysis result for SHA-256 17da2264dbc8c751…

MALICIOUS

PDF

87.2 KB Created: 2021-06-27 05:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d52b6752bf2ab09b7692756b3941f9e4 SHA-1: bd00f927384737badfe06501cf22d447333f8fd6 SHA-256: 17da2264dbc8c751691e2d76f7f1643c9a4d98245c6a3ecda82000df5fa3bcd5
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://vayamcs.com/content_files/files/12050008395.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609893b16f19e---dekimasuvoxar.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/200a2fb9c2805f6a49ef91bc66abdb21/ragabinugojo.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/m4f48765pnclgck8jauclo5blh/66903158588.pdf
    • https://sealskinz.ru/files/file/marukarubiviwilivikisegoz.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/17c30fa0fe1e381da084387fa0e855a6/85626115130.pdf
    • http://yesilderecine.com/admin/editor_resim/file/funasa.pdf
    • https://cengilli.com/icerik_images/file/mamuxisasufamilivavutali.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a02d951c0b906f03750788e7a5d8528a/37280118483.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608088daf326f---77491870873.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/9600a02dc3553b1f594229454d9da2ca/wigiwazujufixedobeziriba.pdf
    • https://communeouchamps.fr/userfiles/file/damexakabeguliwi.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f6b07be65---86626339227.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/1c7ba38edee4c27ce190cdee52ba83f5/18216428361.pdf
    • http://copy2d.com/ftp/image/file/xexupowukosedalafabuwe.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/mtq3na7ll6airt7p52i3p5r5h4/nabokus.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160980f9837821---sobigunaranenisubu.pdf
    • http://assistance.uz/images/shared/file/79659593505.pdf
    • https://adepotcustom.com/UploadFiles/file/20210508090324169.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609a0eb9c33f6---94267916379.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/b05ciornrmsjq51gcd1q9igc3b/kojenejebisivulol.pdf
    • http://ateliergermain.net/sites/default/files/file/81026212895.pdf
    • http://byty-pardubice.eu/UserFiles/File/98836749973.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=a+quadratic+polynomial+whose+one+zero+is+6+and+sum+of+the+zeroes+is+0+is
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d54d.bin
55b5b0725475005ec758aee42a7d7be5a6243263054323677153913a8c3e3e07
pdf-font-stream PDF embedded font (sfnt) at offset 0xD54D 18372 bytes
font_01_sfnt_off000105ae.bin
53183b210e805f908d647d417753b0a6e25e4c6656bf487bb7399d067b99a755
pdf-font-stream PDF embedded font (sfnt) at offset 0x105AE 11660 bytes
font_02_sfnt_off00012124.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12124 16088 bytes
font_03_sfnt_off00013659.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13659 16792 bytes