Malicious PDF — malware analysis report

Static analysis result for SHA-256 218b33b40d6cd18c…

MALICIOUS

PDF

90.5 KB Created: 2021-07-01 13:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee0e2d7ddc8f662c8f73c7b637bdd856 SHA-1: d7f33afc88830b71349e9452b5f5aea923d69e4e SHA-256: 218b33b40d6cd18c1f0a3c849199f4cc7da3abf71caadae032b8ed781db8f513
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=post+tax+super+contributions
    • https://hunde-katzen.at/soubory/63941282262.pdf
    • http://ahchala.com/img/file/74407589639.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080356d85320---xotekazimedipevojevu.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/11803853190.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/g619edqfhq8ince1lfq079suv5/34744437971.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ab1a77b47af545b5cc2e3407241ac1fe/zedesureposilixadejagus.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/t3b3ep5l8snifmnsjbrotbbiqe/famavemekipekata.pdf
    • https://deltagroup.bg/uploads/file/mepewix.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e695930cb0---46954074676.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe3f968ae---74999549909.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/a12fdceacefbde95958cd7f8ceb8fb33/xovileparuveme.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073dea64d771---wevolasaduzedus.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3592408bfc8a59334a6d633b44ed71f4/14519746216.pdf
    • http://hillandcunnreunion.com/clients/864369/File/xonajeritidagosarukawe.pdf
    • https://aduanaldelvalle.com/userfiles/file/xekiwuvitofoduzon.pdf
    • http://textingrights.com/userfiles/files/buremorunemuzezatabel.pdf
    • http://iberia-ex.com/images/blog//file/31757339866.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/i8vv35p78f91mop65j1ettcel6/15342757864.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb53d00258---someluwezemeterexoti.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4ad5ed8fd5f4f0e4a479f07eff3b4014/xunalalane.pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/matofobebi.pdf
    • https://muachungbaohiem.com/uploads/userfiles/file/88146069083.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160acdbd8138a2---pememaparebemejuvitijo.pdf
    • 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_off0000ff89.bin
4f29c828e9e087a3ec06a633e786f20cedcd927b4d6506a0dfdd4f15868ca255
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF89 17256 bytes
font_01_sfnt_off00012c87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C87 16792 bytes
font_02_sfnt_off0001449e.bin
1e410d05d18833b5f3d0d6dbd115647e9e950ad5870094d2a3305ef7b6a05fe4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1449E 10664 bytes