Malicious PDF — malware analysis report

Static analysis result for SHA-256 935314c564adf578…

MALICIOUS

PDF

75.7 KB Created: 2021-09-08 21:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ccfac9eeb0586bdaa7119affb378853 SHA-1: 5538ebacb69b23e6472f0c19438b150792f8a26c SHA-256: 935314c564adf57862bc5f0f8467f357ea66328321120e98c112dc4fc7e5a6e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Several heuristics point to the document acting as a link farm, directing users to potentially compromised websites or disposable hosting. While no scripts were explicitly extracted, the nature of PDF-based link farms often involves embedded JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://ibnuaffan.com/ckfinder/userfiles/files/pogogumarixuwurekupo.pdf In PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e68d55cb0---robikujemesigokizunozoj.pdfIn PDF document text
    • https://partetesal.ir/data/file/paxagetegoduzekofulanetu.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-8/20210908020601104897.pdfIn PDF document text
    • https://arendic.cl/files/12424849515.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/53549595969.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/10330207052.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/2756037938.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/68380906447.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/bazowowalujumixe.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/43149082635.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/25605208851.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/80853145383.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd0009d6b4---11783124671.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/99080036887.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/35496191873.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/marugegogasisokugefiwetu.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/34436453568.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/mafotinuz.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3a796787kgfu82dsq0srdf5c68/vosavuxolavuluwamuv.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/17295425953.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/vuludawim.pdfIn PDF document text
    • http://ty-int.com/files/files/pedazi.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/88662151170.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/jakufodujofuzudero.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/wizurakitebenux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=coptic+orthodox+study+bible+pdfPDF 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_off0000c29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29D 10936 bytes
SHA-256: 20c21a48f24c5c72f0def1723ef53cd2be6cafbbe8e987fd90cf70e7cd84e432
font_01_sfnt_off0000dbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 17584 bytes
SHA-256: 0e263f97b12a9338e976187f6a16c1ad08ec1c23846a335a6ac231efb33457e3

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