Malicious PDF — malware analysis report

Static analysis result for SHA-256 415eb11d5e836ee7…

MALICIOUS

PDF

92.5 KB Created: 2021-09-12 18:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b455858efcaed869e2039cb695fb5b5 SHA-1: 2e3eb5e3b472e059bc9f2ed1dff36e174ec7496e SHA-256: 415eb11d5e836ee7f09275ccc610e6538755e4e6f9c85836f48f64f23c494cc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://romalasergroup.com/userfiles/files/mavozu.pdf
    • http://uniradioweb.info/userfiles/files/62749129158.pdf
    • http://westfallassociates.com/documents/file/wuxuwifun.pdf
    • http://thechitay.com/uploads/userfiles/file/pawijuna.pdf
    • https://autosaloncenter.com/uploads/files/56467019250.pdf
    • http://traktorpulling.de/ablage/userfiles/files/84844949333.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/m80dfv3828eia6ind5ulq4u58g/10878939753.pdf
    • https://hitourkorea.com/FileData/ckfinder/files/20210910_E768C60E271C79FC.pdf
    • https://phu-komplex.pl/pliki/file/xopapoboligepokazivedit.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/j23rvh1lqn0uv530roq6eb6l4v/nakofalugakojafivimiki.pdf
    • https://digireg.ru/upload/27514109684.pdf
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/pusegifusufag.pdf
    • http://trieuduong.com/images/Download/zimibujevifomobo.pdf
    • http://saipanbooking.com/FileData/ckfinder/files/20210904_E4853B413CA8CABD.pdf
    • http://3qbuy.com/CKEdit/upload/files/21171765443.pdf
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/zafawewo.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/31932009832a67990c30f1234413b777/dupodir.pdf
    • https://taipeitccia.org/CKEdit/upload/files/93111992494.pdf
    • http://massarentearchitettura.com/userfiles/files/61316695362.pdf
    • http://arohitourandtravels.com/userfiles/file/xoridijawawotot.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/gigubot.pdf
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/gabezepegisesekipebo.pdf
    • http://criollo-cocoa.com/userfiles/file/zujijejiwubovenokipilu.pdf
    • https://annekienlen.fr/imagesfile/47428371850.pdf
    • https://renault-service.com/userfiles/mapojomokopafike.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=song+of+the+open+road+questions+and+answers+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_off0000ffc1.bin
267daa035a145e03fa3aa7947a52bd5600244b8b4b823bd9405377a1394139e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC1 18896 bytes
font_01_sfnt_off0001304d.bin
245969c4fbd595a279b19c38f33d7e55169a975391aad416edbd9c85687ae92b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1304D 11136 bytes
font_02_sfnt_off000149d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x149D4 16792 bytes