Malicious PDF — malware analysis report

Static analysis result for SHA-256 af57c573ccec8eba…

MALICIOUS

PDF

74.3 KB Created: 2021-08-10 16:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5c0f4a6e601efeeede7bb902958c3e73 SHA-1: 4a489f34addda2013f8cfffcb4c0514597aae220 SHA-256: af57c573ccec8eba6cd0ca2a67bde25da5061409360e0a31beeb1f2b87d1adf3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely serves a malicious purpose. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to lure users into downloading further malware or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5355

Heuristics 5

  • 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
  • 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://synerhu.ru/uplcv?utm_term=sixth+sense+technology+seminar+report+pdf PDF link annotation
    • http://faizleathergloves.com/userfiles/files/dolilipemo.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a84aad1351a---namulumusufajafiberedo.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/17d9290e866b36a2a7173d00a2693e4d/kasutasome.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/be5324794354352f5b59a02afd1663ce/zodafuzonukavuwubopawanu.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202107/1627695782.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d154179bc0---vesarodup.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091dd6dad631---begazaxokawijepa.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3642d5e1804e3b15e6868d7bd86c5450/rukorarurodejusivut.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10bca85b96---xudapizu.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/12144546174.pdfIn PDF document text
    • http://cpils.com/userfiles/file/zekusil.pdfIn PDF document text
    • http://cpils.com/userfiles/file/xufuwidelesozeguwi.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/86378984623.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa56d24d50---dubugodusoxozidirubakej.pdfIn PDF document text
    • https://kalewebsatis.com/calisma2/files/uploads/zomuzezoragovajexapo.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/bbf723912f7aa5bf3ee9b9a8ecdc77c4/78814807137.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2934e3abbd---94837382777.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608906fc378bc---81849110098.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/dukepef.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/7092e297b23067b69b58af61abd8422e/sesinuzojoperexizovem.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/68537523193.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/38303375627.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/b4137efe2ef1f229c7257780b1b0231d/kisomekuwazotojoxomanow.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD592 17492 bytes
SHA-256: e206d66a079c0bfd4c0bbfe31be60ca834e16d94951dad5122259230f3911a52
font_01_sfnt_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1