Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7fa1f3fc8bf6d5…

MALICIOUS

PDF

86.0 KB Created: 2021-09-18 21:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56efa9cd398eca0ccf6c7e1c45c76e3e SHA-1: 55ef1965ebda81d4190b99893a01f494663c2f74 SHA-256: ba7fa1f3fc8bf6d55f0d00573c21174a8450dfbc1993883fa18e2a7579dc0b2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malware.

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://archism.ru/uplcv?utm_term=keeper+of+the+lost+cities+1+pdf PDF link annotation
    • http://bisenzia.it/userfiles/files/nolojuwavitufeva.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614508271421c---50698959925.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/28424260535.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/b4f4rpc09bmfl3kc3mmep31ddb/61496567989.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/78565152771.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/8e6aea526964120ae92471e6f87633a8/gujomoketivuwun.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/rumiji.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/47228278448.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/88343711448.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/24526070733.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/92355004195.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/fupevigufiduv.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/joxabosabetojabuk.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130baed949d1---faxinovodoremurunexi.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/5872580286.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/90958612545.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/wakalelu.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109040728016798.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/kimepakapifutevega.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614256f16440b---84336568132.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fcc7bdb27---vekewaroje.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/3749441163.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/zipiliwukomawasar.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/wemepiwujotopojet.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FB 10496 bytes
SHA-256: 3af3cfe464c2ad67476ff5a14fa74954e9a938e4ec37953cf423aebe257753f0
font_02_sfnt_off00011b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B00 18276 bytes
SHA-256: dfcceda2d208826df67f02552412bc14f1dc51582b08fa10fc46b4daed1a94c4

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