Malicious PDF — malware analysis report

Static analysis result for SHA-256 655d107db35661fc…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 05:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 51e4c0bca5be8a2865748a1e32598c9a SHA-1: 767dc84de9f31931953dfe197a51f07ebdd31c9b SHA-256: 655d107db35661fc00cefaa1e77cff5f1c2240f148de185064ca83f19fee890f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites. The PDF document's structure and embedded URIs suggest an attempt to lure users to external sites, which could host phishing content or further malware. While no scripts were directly extracted, the PDF format itself can embed JavaScript, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4827

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5c81a6f81---zawiguduraviwupademosop.pdf In PDF document text
    • http://sanruou.com/app/webroot/uploads/files/19713049869.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/90614803301.pdfIn PDF document text
    • http://dfanchem.com/upload/files/vapoporururofu.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/87142200891.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/67549860879.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/kutitifafubemox.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/dorabomigi.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/1532628397.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/ririfesevegifanuzider.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/tijutos.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/sojixidej.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/a1uorc470vuvovaic2jgpmn7d5/3765634869.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/14327454694.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/zorarudenufotuzulogekimo.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/95701809089.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/64485373536.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/rudolivuxerenemozubi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132709d2a665---56678952226.pdfIn PDF document text
    • http://apismorava.eu/docs/degevujamovijes.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/69147017850.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/14885105166.pdfIn PDF document text
    • https://teamcode.net/upload/files/jurilunakebuperebop.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355dcddb138---67404430477.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/vuxurojaniba.pdfIn PDF document text
    • https://siroyensao.com/upload/files/29561819592.pdfIn PDF document text
    • http://grimastone.ru/files/susezatumegugusuj.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/sinukobasesonesasivej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=fast+and+furious+8+full+movie+online+123PDF link annotation
    • 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_off0000df42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF42 11208 bytes
SHA-256: 52645411fc052051f4315841d9662b9ae775b82ab45739a42bc47be4dd92b278
font_01_sfnt_off0000f99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 18016 bytes
SHA-256: 3880fdcbce009c59aca2ae6fd7d7deece1d013f184371c1f85de130c7250a7c1
font_02_sfnt_off000127b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1