Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a1fe6aaad2ece3…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 05:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1e3cc8c2325b93ed87d6a21498bfee00 SHA-1: d333ac84d1036d0e2467ab8f6f533c1ac2c5304f SHA-256: 75a1fe6aaad2ece3c02f70dfe59593a9794184911a5a21f6baa4b2c02dfb4aa5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that likely lead to phishing sites or further malware downloads. The presence of multiple compromised CMS upload links suggests an attempt to leverage legitimate but compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://drafthe.ru/uplcv?utm_term=chinese+phone+games PDF link annotation
    • https://2acontractor.it/images/file/37380586417.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/16014fd960330d6c842ee8f2734433f1/54082786708.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210910_AF4119330A209A0B.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/punegep.pdfIn PDF document text
    • http://zl369.net/userfiles/file/koxasogo.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/82242872741.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613173e25e30b---kofixavobiteva.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/96fs7sgk4qbvcj32ll0ft4sjvq/faxafekafobunajanonolokew.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/44100429087.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/20796204389.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/49010525748.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/ruxedawunowogetewuwe.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/pejoge.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/21404033634.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/35735201706.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/xukamewexutozarobaferad.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/bukevaxil.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/54766797471.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/mopalezupidutozikug.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/hdf8c014v1rugtlc0dif3liekf/25065556217.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/10219859813.pdfIn PDF document text
    • https://777mto.com/contents/files/81172993128.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_off0000dd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 10484 bytes
SHA-256: c2cd7a76475fe3ce18c3432f91a9e73771772b3eaef65df41c4b96786c8f2b61
font_01_sfnt_off0000f530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF530 18604 bytes
SHA-256: 4cdf635cd380f01c38f8e3efd99f4a0563c6564a4bd1fb579ddbe958781cc222
font_02_sfnt_off000125bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1