Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d69d6fd6033d70c…

MALICIOUS

PDF

73.4 KB Created: 2021-09-18 18:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: cb9b2c913fa792298c3585402e7d35b4 SHA-1: c61165edf2e52e9f589fcff844c21f894be98c73 SHA-256: 5d69d6fd6033d70cd91181e96927bce4ab4fa48bd8ed102b1bd270b296fc2354
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137c0bd9024a---xidusan.pdf In PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/18026673144.pdfIn PDF document text
    • http://martonelektro.hu/files/file/xevitagujewuvunajile.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/4e19a0019142e582581433c171612adc/wopefeweruwefo.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/xaniluderefajuzanelivu.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/71288381529.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/57731896448.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613295711b69c---pojunu.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/49770067445.pdfIn PDF document text
    • http://electric-kernbichler.at/33138273568.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/wisunuf.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/vonazivexiwam.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/zepaxubifofadimo.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109160606529909.pdfIn PDF document text
    • http://spiregene.com/image/files/20210909_125653.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/93559357721.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7a5817649---12802128595.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/5498890960.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/tiwiwagezudujiz.pdfIn PDF document text
    • http://qdjshg.com/files/file/zunikipasatubojelazubolu.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/58060599992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=play+store+games+for+pc+windows+10PDF 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_off0000ba5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5D 11340 bytes
SHA-256: e225561acb75374da74c0bfd14597964574808540670c6e9cc08fe1c44d23a8b
font_01_sfnt_off0000d503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 16620 bytes
SHA-256: 32f8405a9e56c3a9f248c9b41fb141cce9db4f900a2724988804137d7c3c8df2