Malicious PDF — malware analysis report

Static analysis result for SHA-256 27424a6104626c70…

MALICIOUS

PDF

1.58 MB Created: 2021-06-17 10:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 48ba52cb310255b988a7f105d6db3e40 SHA-1: dbaf9ce36c269f30a428f2c6d5a3455ff9968fa2 SHA-256: 27424a6104626c70ce923ac8ecec5b1d105670c1bbbd401ed85fe9a37e4d0330
96 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a notable heuristic indicating a link farm pointing to compromised WordPress upload storage. One of the primary URLs, 'https://smidgel.ru/uplcv?utm_term=mr+daniels+hypnosis+castle', suggests a social engineering lure. The ClamAV detection further confirms its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier clean score 0.0115

Heuristics 5

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=mr+daniels+hypnosis+castle PDF link annotation
    • http://amghanoi.com/images/ckeditor/files/denuzewugorovimuwedemobi.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166644d958---26893318340.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/87375386612.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/004ca9ea6edd022918408f1aec746941/somagokokinuvekowimuf.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/94160836379.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c140ec5ac52---81302653624.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ade3efa9b---lekesigavesitofo.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/pverf33vu4pf1v6gcra571drqn/rilusekajesaxowakoxawus.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6d4986973---midisepogutodo.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/akopm3ks24vohjh5f1i706tgu7/20111943420.pdfIn PDF document text
    • http://jar-ted.pl/file/5095471819.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/df2e74face1e41b289caa71203d2d771/roxaloro.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/246b4pb4blvqpjofvdaau4crqh/19174820618.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/nidigi.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/wisewowulavuberuvavinezu.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/xozaxamezadekozimu.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/lamodabodo.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_off001903a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1903A2 5268 bytes
SHA-256: 89596b4170dc32bc2ad3daf8b962e758db64537bd97bc31498621bfc410516b0
font_01_sfnt_off0019159e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19159E 11992 bytes
SHA-256: 1f549467f8de62b911d0b120d278d3d86b5b28eccef3a09f49653e39b057be89

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