Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0d1b1c6b82b764…

MALICIOUS

PDF

83.4 KB Created: 2021-09-03 09:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7ae9a633bf64cdca13f5854932c720f4 SHA-1: 74ff0e58b05b97ff83d5b2e03a0b3d7e6bc251f7 SHA-256: 5d0d1b1c6b82b764099c7c9a69f44d57ed12376ca8300f9d0506cd50ee211045
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure, often initiated via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://edgecs.net/documents/fikujukigipimurisaxa.pdf In PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/kosilifavetegiw.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/61203805153.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/negejabadujubobopobat.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/xujiwiwavigunuwubinuluri.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/wujubiziginewumux.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c56f344b78217f3d87f7a863966e92a0/migoxajodogu.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/bilikixi.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/95562180482.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/d329e78cc7abb1662255701c90040bca/21761165808.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b1074c263---lukunimeridutilalifobeg.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/hg1p4afgmm1kockiua2fb9d2u0/68242977861.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/vasibodusofenudifopes.pdfIn PDF document text
    • https://rajaunited.com/contents//files/66245452592.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b432a309996---34179281457.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/89783984116.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/f56973a88ec51a824267a5eeb9409913/98375588895.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/7b5b75525d9abcd29176f802c7841ba7/50050814638.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/wenajajawivu.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210621112709_35522800.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/wimagezerujowu.pdfIn PDF document text
    • http://nkland.org/userfiles/files/ruvilifejejuferidofarariv.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/0d6b881651045aeba0b4343cf2e055e6/nupekuseguturuvaxiwugewul.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6bffb2ce5---84518738183.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dedc32f2156---sonexumak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=master+editor+pdf+ubuntuPDF link annotation
    • 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_off0000e171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE171 10680 bytes
SHA-256: 9ccf57e388c7385b1c665c8d2fb1d5ba33f1454ac3cc2842781ba0f0e1bb8784
font_01_sfnt_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 17764 bytes
SHA-256: 78a61703377357b6b5b3d9d03740c277a7e2a37eda6ca5e5840b917de2587a51
font_02_sfnt_off00012827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1