Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d8346d58872adb…

MALICIOUS

PDF

84.6 KB Created: 2021-09-11 19:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af6abb7142eccfbe952e6cd29c0a4994 SHA-1: 9dc278d42b3ddc79765991f97dcce2b0eaafc050 SHA-256: 52d8346d58872adb260c5b4e08d94247fdf1c63f70f6300e3831220638776486
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and malware detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://rjt1.org/upload/files/96016903302.pdf In PDF document text
    • http://euro-ex.com/images/blog/file/81065308595.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613c68e2c6968---tosezanerifefulegagobude.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b69afb323c---jusomonatidagitomabade.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/55af028dfd32a4907851b6b32940a78b/lasodaxuwonisegedenel.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/34117757599.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/15107895121.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/55719145129.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/niralotisoto.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/36092491332.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/8492387941.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/88754839563.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/sisuzapesasidik.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/bf2be77482e703ee273b80483f289c72/nisirafavaduxeteverizera.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/fanagifujeloj.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/nimuvilof.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/jigavizuv.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/fidukixizesetev.pdfIn PDF document text
    • http://knipia.com/userfiles/file/81483226589.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/28947437409.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/zexopubosisi.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/bekuzajarotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+pokemon+rom+hacksPDF 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_off0000e58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA4 10644 bytes
SHA-256: b5c3cc907a712aacc23a0235c46c40b3d1d6b8e580e5da92985854cc5e6e6740
font_02_sfnt_off000115e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E4 18156 bytes
SHA-256: 7e7c0e1cfe0b28140b62b2449579019147010d1d99f7fad94243a2fc4f131e45