Malicious PDF — malware analysis report

Static analysis result for SHA-256 c319ee000704731c…

MALICIOUS

PDF

79.4 KB Created: 2021-08-27 13:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 93b6b67ceec172f3c28556a0fa4bce8b SHA-1: 4a0c4032ed6cb8df31bdbb52163af7cb238c23fb SHA-256: c319ee000704731c00bfc98fbf0ddef4b51b417d53560011ce697e91ea61b083
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm. It contains numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=8213+w+waters+ave PDF link annotation
    • http://partner-support.net/user_data/userfiles/files/gezofopabajeketusop.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/04613fb6ce9fedd1e5616362c08cd696/dubudefajapotadukemirum.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/0083b492d44f8af5da476d7acca72bc3/52862473641.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607181f067ec5---45067495506.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/relupojutenob.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/fizoruz.pdfIn PDF document text
    • https://medtek.vn/storage/file/56721132788.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/37747761816.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/92358707854.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/70264433099.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/d236109569e4deabd951d2ecd2c5ccf1/zupizorirenotoja.pdfIn PDF document text
    • https://10s317.com/uploads/files/202108230649336366.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/66536783030.pdfIn PDF document text
    • http://954move.com/clients/4890/File/xetomanaperivelewaxed.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d8200cb81e7---nidizatuwumanaj.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/wuwina.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/15d1f88806bc5a41dd1c487948060849/vusiwes.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca138125541---larasovesatizige.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/pulera.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/56181128000.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/xozika.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b59f4420eca0f73939327dfb2250c6f0/vosumeduwurale.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a845f4dea1---44244428299.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/moxuwiriditezi.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_off0000cc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7C 19444 bytes
SHA-256: 83acd85481f091426e2dd2deca7adaeaaf9bb2733be436176a06bcff7ea4c78d
font_01_sfnt_off00010033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 10344 bytes
SHA-256: 4591c55f77cf065c4e73053af1825a2e2cefca27ab943432481bdb25d48c51f9
font_02_sfnt_off000117e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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