Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d7f653bc28d7d8…

MALICIOUS

PDF

69.7 KB Created: 2021-09-24 23:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3718c288e8bb99bc88f7bd70db9989a8 SHA-1: 00c573ee5264d5c680257ef64cbc87fc9a92d3cb SHA-256: c3d7f653bc28d7d86ac08cc401a01ddbe5b94b79b905125cb021f56b7a205512
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites and disposable hosting. These links likely serve as lures to redirect users to malicious content, consistent with phishing or malware distribution tactics.

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 https://inwebjor.ru/uplcv?utm_term=taj+mahal+1989+watch+online PDF link annotation
    • http://mytrangroup.com/uploads/userfiles/file/gefogilokuweviniritifafes.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/36818343796.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/8600758243.pdfIn PDF document text
    • http://test-immo.com/file/zobixa.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/6564604468.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/1124634327.pdfIn PDF document text
    • http://clingac.com/d/files/70006624463.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161312f3adad1c---44572108568.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/ramuwozomewofibemuwuror.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/panodowopurezajapanubutof.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a62cb1fac---57932121792.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/47473359238.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/naxotekodutux.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/jewof.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/bokijujerobira.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/43c847e71220b8d9cbf9ab899283f68b/mitabojovulusup.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142774f7a758---digitufijovinu.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/lelibabubodijitun.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/gigakosuxowoxuweja.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/49f2874033cf6ee790a91011a30b2087/xomanuninikoba.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/93448368441.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/54422513609.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_off0000aecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAECC 10836 bytes
SHA-256: 7472e12346b6f29e3143bccd4f14f0a3e507b74fd48cec199997641adae3b497
font_01_sfnt_off0000c7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCF 16336 bytes
SHA-256: 089f1b66b92afe835bb36fd2f74b20234e07eb8edd789df080a01cef47a50593