Malicious PDF — malware analysis report

Static analysis result for SHA-256 47a2ea133f77a22d…

MALICIOUS

PDF

71.4 KB Created: 2021-09-14 02:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 97a6b83893eeaf92384992573e1de5b6 SHA-1: 38f0ead68fad3c54b700445a127081501af79980 SHA-256: 47a2ea133f77a22da45e093398b0c2a9ef54aa491180c107cd94edf8be77ed04
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9667859990.pdf In PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/patuxivadeperen.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210910102827.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a173441e9c---wikaraxiwerawakaruraza.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/salafevu.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/63620321694.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/13754449757.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021090305192873499.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe4cf6f4a8---23889444925.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/25192136995.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/38453361516.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/xobakaruturisimegodan.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/95472435753.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab19d97790---kuzapilowonux.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/lolumitikazonajazu.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/suwufusagopokafanesefu.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/75879229792.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/27fe771a73560a4c50873f91a3093366/92299185740.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/pajawelatidofukigixolov.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/26830990997.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/18766495061.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/39823181914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=excel+2020+crackPDF 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_off0000b97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB97D 10060 bytes
SHA-256: 7b98d90fe35460b7b28275a7802139ced52b78286b797deafad6628daf2bfd7e
font_01_sfnt_off0000d013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD013 15888 bytes
SHA-256: 938fa618c20312e05ef0de96f5a71a7070ef16bbe51d89ecc8f487d1ab67293c
font_02_sfnt_off0000f885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1