Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fee60ca2b75535b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 05:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 01462f16e2b7d3caa9d66242d53073f5 SHA-1: aac2d3a3d35bea5c1c56ef6a2492744faa38e02e SHA-256: 6fee60ca2b75535bb858e50f0afa1f428f0b35febf49fb64c2bf8e4637023e2c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links with 'utm_term' parameters suggests a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=tidy+janitorial+service PDF link annotation
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c4a61aab9---xovisakifotuwewotugimasi.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/5891814346.pdfIn PDF document text
    • https://designclarf.it/file/rivuwofobi.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/3559274247.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/mexibojimisovafusulig.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202108131653026663.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/80787668288.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/83592265094.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611fa5289193b---zoterixosuwuzo.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/14381267237.pdfIn PDF document text
    • https://le27.fr/docs/file/78427665461.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110a7c8caf8f---77430023435.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/31g89tgpbom41q2rll9hh61s13/mogoxubafot.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/99853429286.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/valiwebim.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b2acde287---dirulupajomu.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9df180c4f85a21e51b9abdc3e2aa154/29037600358.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e58179dddb7df413aca047a592fba20c/gerasoxudowuwitul.pdfIn PDF document text
    • http://belniig.by/public/file/jotuperuxuvaz.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/fivajezitazi.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/nunisofu.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/tesukisinosimifokumovox.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/47665451094.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/88854533214.pdfIn PDF document text
    • http://szpk.hu/_user/file/jovewebosipirodulitesak.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/dajatudumabedufuwuw.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_off0000d781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 10636 bytes
SHA-256: c0233093b7d5d6ed484ad821a035985933de5b5173a13a78ec8df0d5e530ea75
font_02_sfnt_off00010809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10809 17376 bytes
SHA-256: 25474cc152d43333c7923554fe81ca02543ee0c5e78ce0734fd531734877e129

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