Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb945ca4c0cbee84…

MALICIOUS

PDF

68.7 KB Created: 2021-09-10 06:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d06fccb0e0d05def87ddd2fe0642fbd6 SHA-1: e0dc57cca39508e4e3eb4b0dcbcf9943e52fe7e3 SHA-256: bb945ca4c0cbee844245a9bbf920c72332f22b77088e180d7c141f2ad44063b9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest an attempt to redirect the user to potentially harmful content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=happymod+san+andreas PDF link annotation
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/puvazedujijekenenememuwo.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/85676024663.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/xefas.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/5691529.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/pokimu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e06f2b9b4---wepedawurenev.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/wosilolexunovanugawo.pdfIn PDF document text
    • http://tochuchoinghi.org/files/pepumotasevizaribomugig.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/zefotex.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/80292515783.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86d5bffe5---kibafoja.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/27062438945.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/12167261926135bda63ee60.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/54715045244.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/63701147276.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/42147881239.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/faxufir.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6b1725a34---basutava.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/4628904171.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/24114669698.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/nisosu.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/88415157296.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/89686068515.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_off0000afeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEB 10420 bytes
SHA-256: 2007ad5f2a846ef9bec14fa7fb3256949020af0dc8a5a068b6cd10f0610ca8d6
font_01_sfnt_off0000c77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8D 15100 bytes
SHA-256: 39ae4a5d23b8175d7806ca716fd8ab0de419578fa9cfa4397b9868e800be7094