Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba0c42b68856216d…

MALICIOUS

PDF

81.0 KB Created: 2021-10-10 12:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f8aaba7af02be524874a2febeb2038b7 SHA-1: bf9acf7abfbaf7b533dd0003606425ff3153779d SHA-256: ba0c42b68856216dc42808ad2eba7ecba6fb5bdcc4b21c166683b808e1734f48
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites acting as a link farm. These links likely serve to redirect users to phishing pages or download further malicious content, exploiting the user's trust in the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://coretry.ru/uplcv?utm_term=causes+of+low+sugar+level+in+the+body PDF link annotation
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b148051298---29231291579.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/4rvt7vtrv93afu9uid5m4q9349/besoroma.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/toxefomuwufikerozisut.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/mukesevex.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131b87b7eea3---80674833023.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/vagokekafifelagel.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/18209347774.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/72570594549.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/27219439565.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/44373212457.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/nedugamu.pdfIn PDF document text
    • http://desirepara.fun4two.pl/uploads/assets/file/25510394473.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/8839693310.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/1105286049.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/29352138100.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/39967142163.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/81057711927.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da5c68582d---bivikifexaledunazu.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614c6b7622a4c---nikadeg.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28984675858.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/99365255744.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_off0000d6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 17928 bytes
SHA-256: e647d6a857859561863d15475c8fa9c4205b71324670d1e1f65c7a9ec38ab00f
font_02_sfnt_off00011cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD7 11168 bytes
SHA-256: 08d762b3e925d1bbfae1dfa01a127b688a800f0a754257f49d42676c276a8116

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