Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f2597bb329e9af…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 00:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0c5eb97e766710538f38580980ea03a6 SHA-1: 60d8c87819c5338152e7a7980382ecb28662a576 SHA-256: 59f2597bb329e9af6fac6ce660a15676dab37edc0e5203e416a2da76184f2dea
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous unknown URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://profesniprukaz.cz/ckfinder/userfiles/files/70887397253.pdf In PDF document text
    • https://soechi.com/userfiles/file/70052577730.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ccbc7363b7bb3fcc4eea893ad352f183/3262985612.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/68365709393.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/jinumumizipupen.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/wigabemupidewepulep.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e35094f41---2152976283.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c4d429a3f---56698991209.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/67iiitin36rq9623pph3q9smj8/potujoninor.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ecbf039974fc20212068487ffbd06847/18940534866.pdfIn PDF document text
    • http://smn69.com/clients/866038/File/244211374.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/69222656176.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0f04d050e---49373831488.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/faperog.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/zupesapodipomef.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/binim.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/6edc1b9184f695d0523eda04265c4de0/32321787097.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/fakumumesevafaj.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609737cf66748---zusajozasumepudagofazol.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/ruzotake.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/649eb334deec409b3f55ce14fe616292/rafif.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608427d50706e---tisiwoliwe.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/ninevobufasubuf.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/89383123912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=steam+card+number+generatorPDF 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_off0000e316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE316 18216 bytes
SHA-256: 5d2958653ffa60c7126362ea1029c672b26aece19741b1c056058da219c61764
font_01_sfnt_off00011258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6F 10720 bytes
SHA-256: 2ae8a78c1d672f2c40400c3f5190c6ce12b4eb441c4f336fea278741d08b85e9

Open this report in the interactive analyzer, or submit your own file for analysis.