Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6519cc4d4eab4d9…

MALICIOUS

PDF

86.5 KB Created: 2021-06-26 17:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8f17adeb965e9347c4a115e5a87ab6c SHA-1: f5694af15669c623f596f53b269f269824868405 SHA-256: d6519cc4d4eab4d9035962c06afccdd1a9b01631cf04a9098335a7cd8355ff68
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites, indicating it functions as a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further confirm its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8f025578f---83540865612.pdf
    • https://hotel-la-licorne.fr/userfiles/file/bimesubibebilejejegaxorek.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/31723d35e07de73bd0f9bd81a40d323c/toludubenuxubokosunaw.pdf
    • https://planet-for-events.de/userfiles/file/52152443365.pdf
    • http://adaviestransportltd.com/userfiles/file/72483906007.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/f5d5ac769c92f64ca13d33177c07567f/85923175205.pdf
    • https://girilawfirm.com/content_files/files/71809100559.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073820a64410---40412469107.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/c0f96ab6e3ff0330d1c4eebc855a2780/sikonubalolorumejuzu.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5e3c6686a4b5b40b44b73ad293026ed3/72175059081.pdf
    • http://cuspsurgeons.com/userfiles/file/74537098141.pdf
    • http://austria-ex.com/images/blog//file/wuzumesizokojasirojezozor.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/ce31570ce620222c194667feac14c921/95099931606.pdf
    • http://ekolojikweb.net/upld/userfiles/file/52179042000.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e0eaaf784---sigelivo.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720e9ad58ff---17609489353.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/3d8ce0e8ce9fc7ef084005aecac1df9b/18347375005.pdf
    • http://abacusnancy.com/userfiles/file/22417549607.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b70cf5d446---zizodapaweguz.pdf
    • http://farmina.ru/uploads/files/98774195775.pdf
    • http://crmrealty360degree.in/userfiles/file/guzutorovoginegeni.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/a3ed26ec253f8547fcd8d233cc4f3863/vikujifadalepiw.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090120804db7---52680846151.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/763cbbae7b606d521d7d8e1e6427ef2b/lagas.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=weighted+clustering+algorithm
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec11.bin
ce7673cbd58723816b9d89941a567100847022162b7351094c81c4b0a0f42fd6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 18024 bytes
font_01_sfnt_off00011bb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB8 16792 bytes
font_02_sfnt_off000133cf.bin
421d43e4574b3e040cb4eabf1e4df12316cb64dfe5f6863006da9150d61c477c
pdf-font-stream PDF embedded font (sfnt) at offset 0x133CF 10912 bytes