Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b16cf36157a62b…

MALICIOUS

PDF

79.5 KB Created: 2021-09-19 13:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b0fc4ed83ce76f9ad9c7df269edfadbd SHA-1: 72f9ae2afdc24a21f6f1b33dd75169b539bdae20 SHA-256: e4b16cf36157a62b11ad759ea9bfc388fccb1625ea4e16d5f8c1e5b800e1c3b2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious document.

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 http://mousike.it/img_ins/files/gemufodanaligopukoxobu.pdf In PDF document text
    • http://stalmont.eu/userfiles/file/gegega.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/89441526971.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/44945451892.pdfIn PDF document text
    • http://airserbia2009.vs.rs/multimedia/file/jeletofanesowerafonopot.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/wixuwiluk.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/53522999283.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/zirakukufezopas.pdfIn PDF document text
    • https://koratspring.com/upload/file/25357213232.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/tufuvopokifena.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/40311940365.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b0c862032238263f5a1ff049198c9c0c/purexasadoru.pdfIn PDF document text
    • http://espokebar.com/uploads/files/52259032600.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/wobelenijat.pdfIn PDF document text
    • http://capri.lt/userfiles/files/84675292212.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613652157244d---92480270727.pdfIn PDF document text
    • http://sdds.be/userfiles/file/31440915067.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/c7271d3c91db296ed05af75335f8668a/34727649942.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/vonugopojaxatafa.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/wekategopezifewamidoni.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/wokakifajesirosokafeli.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/rovivijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=hrithik+roshan+kaabil+full+moviePDF 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_off0000d192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD192 10868 bytes
SHA-256: befe75a91c3faa295579388063ddc117227bb5a7d03df79480efe9dc9047b48e
font_01_sfnt_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 17884 bytes
SHA-256: 525959cbfac3fdc239a01ce49f2dce75c5eef64ec4d435e1b131c143126b3817
font_02_sfnt_off00011873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1