Malicious PDF — malware analysis report

Static analysis result for SHA-256 1507afa251da98fb…

MALICIOUS

PDF

106.7 KB Created: 2021-09-16 09:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bd58cd4237c58b89757bd92175af37d9 SHA-1: fe5bc36d5129819e5d586e93c41a54b064315029 SHA-256: 1507afa251da98fbad5b7717ad45908dcef4c00e41edf0749775788b3abb6be6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection names point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://coretry.ru/uplcv?utm_term=super+mystery+dungeon+rom PDF link annotation
    • http://okfilm.kr/userData/board/file/fivalupidopuf.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9nl8gpdlu8r3jfkstglqtok7fr/bojuruwenipulesokutokuzi.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/venarudawenubaro.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/87795070484.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/56689949466.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/25d60b18c835b362dfb5f166a6356b47/57232387825.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/53711528894.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/90340811110.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/zatibewu.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138571b4b59e---43782943279.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/96786606757.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134886b1c85f---xiweziruwipa.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210901_04257A8074A9A076.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/fozunafotenabuxufan.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/5416061117.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613969cccb3b5---nefuzojukisajozawajelogup.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/26869624538.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/85a50df1bc8fe2ec6febfcd428686d54/90721671766.pdfIn PDF document text
    • http://blgjad.com/upload/files/27200931738.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/9e9fc5a44cfdc9d7f0e37fe6d01d9e92/60691508533.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/jilazuw.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/50ab4b754ff1ca1283a2891ddb50680d/17100823205.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/24540855301.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_off000135f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E08 10724 bytes
SHA-256: fa697ea3478dafe69404d01ca6ed2d0b2e55b3ba1db6964ec29978f484726068
font_02_sfnt_off00016670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16670 21052 bytes
SHA-256: 4ef0c47fe9411a3aea01c87d39dfaf7a84db0731e5c694f2be15e531bada9bfd

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