Malicious PDF — malware analysis report

Static analysis result for SHA-256 89604702fe7ab11d…

MALICIOUS

PDF

67.4 KB Created: 2021-06-07 03:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d9993cb1bb4cf29992502a3a1654883f SHA-1: 27c6f0881f2a2dc2d3e9aa70e8cb96959c6994c2 SHA-256: 89604702fe7ab11d3210f71a3a5f74c2398004f9f035b536d7a503db3097eafd
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm pointing to compromised CMS upload storage, indicating a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the document's structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=a+silent+voice+explained+reddit PDF link annotation
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6f5cf92ea96a480791bfe4ae5836781b/98564620189.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/14678a463f87562d18e7cbc620021028/50587915325.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/wojijusudil.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607521d7c33fd---jenotalegorenujabudaru.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/77b242578e2a92e72c76501ecf1a8344/89281088192.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2ab563aa4805e1b611c15312a010cb14/92112995420.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1830c094a1d3e6945cdd385766618de3/nakorut.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/96690054383.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/jl5clukvjbsfrfhhra527gduug/jakowujadeberibozi.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210604162284014724.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3b70475b1---54707606898.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607abb643f2ee---zanomiketi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eca6e68976---96063199932.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/c6d3539031143eab29d6802dd5a31e5f/95427527365.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/tabuxegidavegenopasit.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/30028492708.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_off0000cb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB16 5184 bytes
SHA-256: 4322eca768dad8c840838accbfc2eee5c47dcf04482f666dce5a0ddfb3094b2a
font_01_sfnt_off0000dcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD0 10300 bytes
SHA-256: 64d313991b7e6f254c698d23a7b5cb03951dd76251a3850e2304a391e4b54d50