Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f122f12eb139e21…

MALICIOUS

PDF

66.9 KB Created: 2021-06-20 07:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: eebb5e0159597d5cc46d2edc1bbfeebf SHA-1: 348a2ea2347fe3df648ee60eaf996e6808aa46e7 SHA-256: 3f122f12eb139e21c3a52d1a1f6694dfd424e09e541828e0f512b8ef68e72ccb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and disposable hosting sites, suggesting it functions as a link farm or downloader for further malicious content. The document body, though truncated, appears to be a lure related to song lyrics, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crewmak.ru/uplcv?utm_term=ennai+kollathey+thalli+pogathey+song+lyrics PDF link annotation
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acb0354564---3226517976.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5c191d3de44009c8aa8a8d616276dc9b/96276652922.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/69298703787.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/8nv1hd1as8k24rt17b986gut18/wesoza.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/b7a043c6733f6a42d824ef397a443d98/kefurezexugipunem.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/etk5j81kasfhfi73pjvq227bi0/nelozerinovikivojerod.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/3np91rgoq67o8ugj7vjrr55fi5/nebesuvivoduwulojugumubok.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/monobiviwaxe.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/10228989400.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/tbl0lapr7lpmg3gh4bditm7m43/tixiko.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/funidemu.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf35ad5eef---13821373301.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/jusakamigasidoxo.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c90ed557fa7---34472429926.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/8sp9dpbjv2s840m9n5iugeqp81/nurudovarejumiweroneli.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/941a3d7dd87454fa520808ee825ca203/48834448879.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F1 5320 bytes
SHA-256: 3817782205480094d94aa0d1df6ff592479f7cac44a3f56d1a5fb3ef6dbd1ec5
font_01_sfnt_off0000da17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 10836 bytes
SHA-256: 1ac10aeac0068f317efa682cb3ae59a3f547f0d5351806a9e693edb1e9531e9c