Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d28a051c3eee65…

MALICIOUS

PDF

70.4 KB Created: 2021-10-01 06:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 083f98d51c2cc7d04ffaff551b117f17 SHA-1: c98dbe3a63b6cb61b310f57beab09356d30175ee SHA-256: a9d28a051c3eee652af5dd83ce66c550921e2fe7d62e4ec1cd8ec1104cd51833
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of JavaScript suggests it may be used to further exploit the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=spotify+queue+android PDF link annotation
    • http://bjavc.com/filespath/files/20210919060528.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/82002093992.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/1b529b5022c342ec8c1c5789a7317986/4946096752.pdfIn PDF document text
    • http://mrybalko.ru/files/xisamamatukaduzikogaji.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/90054159700.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8c82ba0c3---82257807796.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/dijunitegatevesoma.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/tarar.pdfIn PDF document text
    • http://tfforming.ru/d/files/tomamevokoti.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/lotuzapamanaronovox.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/78296884665.pdfIn PDF document text
    • https://weingut-suppan.at/files/jipek.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/ba4cf4db510fb07e9038659c6ade05a4/josunivurikagogofanetubu.pdfIn PDF document text
    • https://nhatthiengroup.com/files/uploaded/files/ramavosolug.pdfIn PDF document text
    • http://apple888.vn/luutru/files/lopavenetevapukaxigib.pdfIn PDF document text
    • http://border-collie.ru/sites/default/files/file/garovexum.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/89066598081.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/67384018359.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/24427264204.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/3a48b185fe7fcc7cc49ac0e68091f5cd/41932918947.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16155f87fc727d---kaxitalenolojagon.pdfIn PDF document text
    • http://zaiger.ru/img/file/43016703631.pdfIn PDF document text
    • http://sivam.pl/files/file/sedezozop.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/35198429390.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_off0000b410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB410 10712 bytes
SHA-256: 4c2421c436bb765680f1501ab34e35261024c579ac86c7fd3d207fc7e177fcbc
font_01_sfnt_off0000cc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC99 15436 bytes
SHA-256: cde6b3c4b0c2ed60952e59e52359aba9e6dd1e7c584b8605cb14d9cc85df770c
font_02_sfnt_off0000f3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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