Malicious PDF — malware analysis report

Static analysis result for SHA-256 c404c09edc4d6615…

MALICIOUS

PDF

70.7 KB Created: 2021-05-27 14:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6df218be80cb9248db48d455d2d02c73 SHA-1: cf1f109e868ad3bce149eaf5a713ff960b6f805a SHA-256: c404c09edc4d6615fcca0c36a085bb708b19dc98b5353cdae667f7203decf114
164 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised CMS uploads, forming a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's part of a campaign to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/dcachiu6n1naedrmr5a2tft2t9/legusesatoxedawelena.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723a8c90720---nuxukiganolevuwukesadul.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/prtcnrbsq4lkddlaphh4u6e1d0/votipoxulariradako.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088af99926ef---bidibulasefosujokew.pdf
    • http://scro.ru/pic/file/16499755093.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4d14cb07a---42929627663.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ofe22c39kfbs82v58g9029lua5/85596821258.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/680d83ae80ade552acfdb772952256ff/setizu.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/lmi537mima54h54tr8rrblq714/detemomiz.pdf
    • http://artecgroupservices.com/imagenes/file/31535383587.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/50a92437e3c6f1ff1fa7879e721c60ed/pamusumip.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7c2f52697---33607173477.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af423aaad8d---663007473.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/ecf3418ac12472f94d98a77f1e7455c1/60746593068.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=lunch+box+full+movie+download+in+720p
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d745.bin
27e46c31e782534687abf6918c972a88f61c5fa2935704cf96cefe702aa0f4ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD745 5776 bytes
font_01_sfnt_off0000eaef.bin
6492f4c0123ad20e558ec0dc18ad178b6971448118fde5f03792eaa76f17af49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 10120 bytes

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