Malicious PDF — malware analysis report

Static analysis result for SHA-256 432c809207cce334…

MALICIOUS

PDF

85.1 KB Created: 2021-07-07 06:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 322f3e10d617465d3dc6108e615e4c7f SHA-1: f461473ca60c9cb2d7d60a3ce85767733af97777 SHA-256: 432c809207cce334b5e013d7366109e55eafaf7cc8dc944f6df6153dd1d15fb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of multiple unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/osbvbjn7o0ogurfnvb4e6ae4td/duper.pdf In PDF document text
    • http://stellamaris.cz/userfiles/4705905023.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/70255776086.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160846eb0e6a01---23191975722.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/ramotogogawefaxij.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/tosuxabexujawuzinosisefe.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/21589835562.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/810e9479db36faa677f792a58003778a/feveguvof.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/677f493f3a953d912640f2b14d8c8f72/25498548976.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607638db25f05---dizorif.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/38565719019.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/88058422635.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/62350425164.pdfIn PDF document text
    • https://wecareprogram.org/images/file/rageborow.pdfIn PDF document text
    • http://unseretochter.com/images/file/galikiwibore.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/78954673952.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/jonafakilaku.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/kaxedivilagepodo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/9qjflli48vs88dp4hu379hdqr7/97167629533.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/990adf5212ccff51b54197edc254c1db/59049628272.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce078e988---zojelovewogu.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/62bd42b4a921e468a57291646920a0f1/14292082915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=signs+of+physical+and+chemical+changesPDF 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_off0000e8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E3 16844 bytes
SHA-256: 2598ecc21411d2d46ed205fe504dbf6d2c7d2d138b02aa6c01f2df91e714fe7b
font_01_sfnt_off0001143c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C53 11060 bytes
SHA-256: 264a22024c04ffc7e06e762e5e62f4ca13e0e088634e27297fd756b75623d287

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