Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3480ec6ff4dcc6…

MALICIOUS

PDF

70.2 KB Created: 2021-09-22 18:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20b75e1ed621c0a960486bfec40b6167 SHA-1: 33dfb8a7063f024aa1737288cc37972d16b45a7f SHA-256: 0c3480ec6ff4dcc6f8e1ed74a500d6accc45d0eab52793267c4be2b3b9d8eae6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external resources. No scripts were extracted, and the document body was unreadable, so the rationale is based on the link farm behavior and heuristic detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=tamil+movie+mirugaa
    • https://petrovsky14.ru/docs/files/bexajomo.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/35622365355.pdf
    • https://alansglobalservices.com/ckfinder/userfiles/files/zijonotiluk.pdf
    • http://wxmx.cn/upload/ckimg/files/202109092332207633.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2c1c950df---58405595164.pdf
    • https://matrainagycsalados.hu/userfiles/file/dafifogekumeraxow.pdf
    • http://ototavandosemesi.com/resimler/file/11971408268.pdf
    • http://kcde.kr/userfiles/file/firasujefaraxaxijofunus.pdf
    • http://jawarakreasi.com/file/benefakasa.pdf
    • http://montex.pro/uploads/userfiles/file/zenupabemiwiximateg.pdf
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/sasovibiw.pdf
    • https://optimustelecoms.com/ckfinder/userfiles/files/foliwerabuboxejawek.pdf
    • http://sladkiy-ostrov.ru/userfiles/files/4559942209.pdf
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/46417629773.pdf
    • http://sbs-group.co/userfiles/files/najitevile.pdf
    • https://j26clean.com/upload/files/gimexugisaf.pdf
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/13678036431.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/fabf161630370d3a4bea26cf90c743a6/80388228410.pdf
    • http://francescofesta.it/userfiles/files/24849954346.pdf
    • https://irrisyst.eu/files/file/folezit.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/bd5113e1b988027638cbe174d3e8a578/karezuresuwaf.pdf
    • http://fluitec.fr/ressource/site-image/files/56194993991.pdf
    • http://www.childofafrica.org/media/userfiles/file/47867015184.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b025.bin
5572c9c60827f758fb8744469e227cfef2e68cb1339356404f61b3f467560d84
pdf-font-stream PDF embedded font (sfnt) at offset 0xB025 18012 bytes
font_01_sfnt_off0000dcc7.bin
2e6f54113c52a2af5f20975fa55acc73b6e3d54895f1e01e730715597f059ec4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC7 10208 bytes
font_02_sfnt_off0000f3a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 16792 bytes