Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df98bb531cd2ed3…

MALICIOUS

PDF

73.1 KB Created: 2021-09-09 04:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6502a344cfb5dc3d9285c1e3b470cff8 SHA-1: d934fd41180fcd3f7e06e3155e8b4eccb239aaeb SHA-256: 7df98bb531cd2ed3755ba2b89b0abb4286c3eadf4a667a0ebf539095e5877d47
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://alrabbancapital.com/file/files/50998897302.pdf In PDF document text
    • http://wjcopy.com/upload/files/jazete.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/nevoribunalipikejikido.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/dapuzeziw.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/30726150459.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/19816386184.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/21308608311.pdfIn PDF document text
    • https://sambelteri.com/contents/files/58605453376.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/galave.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/31613443444.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fedb0efb6d---37864672109.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/81807419127.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/daruxupab.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/59879776394.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/11586289264.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138487b967f7---demejuxoxeluvegugakap.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/xejavemega.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391033af2c5---25675465768.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090323210784.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/bebazijutixulexodusiwoza.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210906_161600.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/bokekabiduwaj.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/lolulabibogolij.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/99301652781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+start+a+statement+of+purpose+examplesPDF 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_off0000bd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD554 15824 bytes
SHA-256: 1785d7ff371a41676470258efa0eab1a2dd469190b56d8fd3b29780af985b4dc
font_02_sfnt_off0000fdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB7 10704 bytes
SHA-256: 6ba4e9e51d5d511f74cf3e66ef6c214fdad8ad6dbfeb6eae30d8d6bb62b780d3