Malicious PDF — malware analysis report

Static analysis result for SHA-256 471f01f777f2bc81…

MALICIOUS

PDF

75.1 KB Created: 2021-09-04 08:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a9aadacde37117e656cf1df9861b08d1 SHA-1: 8cd1c1be1986604e8b3bb0a905c775a589c1edbe SHA-256: 471f01f777f2bc81a13e8c22fc5490a5fb5eee70af0510626bf92b400ddecaab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=sekonda+chronograph+manual PDF link annotation
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/1bbk3r0plcdccntvu9d7r8stui/guretokesigimabujoxija.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/2d3f026301c85c91a898435c24694c7e/22224988405.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/12184145706.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4136ea9ea---nixutifiruruw.pdfIn PDF document text
    • http://edallyshop.com/upload/files/bidesen.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bc5pqn9ld07a2fao95dv1n8hsn/dovuzem.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/nifedipaw.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/vt0c19fhaa7bfv1n9hctfpskol/47856400019.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/zedewul.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/84002550228.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/35ebad9132fd1c81472ee8707b3f196f/lonamolonelefezam.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/t062c7fn4nnhkamohlu9lqjdpo/53098504360.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/lonenofafeluju.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/47285368381.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/fakevi.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/0p9b4rhid3kno8rk3pm55em2mf/fanamuzufemax.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/boresodeg.pdfIn PDF document text
    • http://sns.hu/_user/file/roget.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/seripag.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/67063054030.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/wotaraxidakegi.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/59017074726.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/zuvigezosajat.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/654bf54eadd9fd48fafabd4c4974042c/42799751836.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/wusekozekal.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/56030701111.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/90360268128.pdfIn PDF document text
    • 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_off0000c02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02A 17952 bytes
SHA-256: 3833be2b81a82ebba12153dc0cf37b910e8b515daf03b4d25ccb09e89be6890f
font_01_sfnt_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 10868 bytes
SHA-256: c2c5ad281457011f61b166719c45debea6ecdb54a54b8366cf152a19234e02d9