Malicious PDF — malware analysis report

Static analysis result for SHA-256 8175a8d5d72818be…

MALICIOUS

PDF

76.8 KB Created: 2021-09-05 05:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 22b5e300712c3a761bd80966be03cddf SHA-1: 1af69d18edd2e5b5091ef2d731437eb1ba6027ec SHA-256: 8175a8d5d72818be94037ca119d4e0f2f8952cc66282b7d8775474d786dcb879
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm or SEO poisoning attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links. No scripts were extracted, but the overall structure and URL targets point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/1jvuvl7fh47lbiova12mkrsfsh/66379188615.pdf In PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210819_019702CF3A47932F.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607753fb9f263---vuvisesuwaxez.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/6l0n8m888bkrrcko9qd61i3lep/96177142935.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078bfc22cb2f---putab.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/2381730868.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/93419181780.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7e10c9d7e---kimigamatoke.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/vasudunubirop.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/buxejubamexutegu.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/67416315038.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd71c57f52---basefopekujowa.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/fugipuxivulufoves.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/562316469.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/febasimopazebofubibaxipeg.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/55967001433.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/zirinudosimaziguzerobelus.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/977pppcsn45v1fjiiapfno25t3/96963471323.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/37484752859.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/bagutuvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=agya+trd+manual+2019PDF 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_off0000c841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE053 17308 bytes
SHA-256: d8fa77746c7febb55819b7c1d672a7d5816f29b307e36b6f501073940b62c99d
font_02_sfnt_off00010d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D63 10736 bytes
SHA-256: 624bd16e41fc5bcccf15f9ad054b96d2e14ee166fe821a42c5ef01eae866de45

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