Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad50075c07ca4a90…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 13:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d34f0e3f306c551d45024f5113271b81 SHA-1: e6ffc9cce344156e132a912831101444ba606761 SHA-256: ad50075c07ca4a90328d9c0a8e8107866ae14971c004594c8d16298e556611a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://masukpt2.com/contents/files/70108443226.pdf In PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/36549775776.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/41204537555.pdfIn PDF document text
    • https://telorgabus.com/contents/files/61435660598.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/palenat.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/zatirowokomovidopi.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/29966545706.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/77913416294.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/40837186650.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/ziruzejanukumawazigakasuz.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/745838645.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d669dcc6f81df1072c21b3d2bd6b0b59/vamovutolikolob.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/42972399669.pdfIn PDF document text
    • https://egf.tw/test2/images/file/rugoj.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-20/20210920115434719963.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/jakitilal.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/7d705fc3f2e6725f8d648d5f1e0be79c/sobotawaf.pdfIn PDF document text
    • https://matratva.in/userfiles/file/46576774232.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139e929dec87---30713548316.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffd09ddd82---lovitumerirejiwaxut.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/62657766133.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/92112113096.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/tixonogegeliterirafewef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=padmaavat+watch+online+english+subtitlesPDF 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_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 11112 bytes
SHA-256: 95c5016e3a294aff64ec46c13d56db21f8c2934c6eb98ed155129d550a9c53f2
font_01_sfnt_off0000f555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF555 18948 bytes
SHA-256: 6b4fa85164ff15bc3fd315d0f4a5a3822c7a17c67d1590bcbb04e9523ea7e04a
font_02_sfnt_off000126df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1