Malicious PDF — malware analysis report

Static analysis result for SHA-256 101ddfb85ad10b49…

MALICIOUS

PDF

80.8 KB Created: 2021-08-05 23:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ab0737e39cd66d0649d4d3be304d0c15 SHA-1: 0cc85bfa72ed471b4aa574faaffd18792c74ff8f SHA-256: 101ddfb85ad10b490658fe325168e3b0567f3f99810fe1c7e244fe0fa77602c7
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 CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but containing embedded URLs.

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://rocksoliddesigns.biz/userfiles/file/durivamajuba.pdf In PDF document text
    • http://masonhn.com/d/files/pezus.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c02d61310f---nifobagezop.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/deaf8d2d00e6ee80d70095318ee41d64/gitekibelolozonivejiguba.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/1951218711.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/lalexudadizipali.pdfIn PDF document text
    • http://distributoram.com/files/file/477964435.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/pepadekis.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/4n21na8g0o0glkqcto56r8st01/vilipikavuvegemazodeg.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d265a9617---8811401554.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/84444912635.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/tavadavamif.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/zopumat.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/6e54b1f577f3efabc8cbaf5f200f133a/32718518932.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16092f16f742e4---jinuxokikalogojawogofa.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/49114975998.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/fazimawixotutajuzegaja.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/zavifagepujifosi.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b98846f9c8---50451582741.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c72f392f6---44443990822.pdfIn PDF document text
    • http://midel.me/userfiles/file/jajitaxuwo.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/94931982983.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210705233509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=introduction+to+cost+and+management+accounting+pdf+nounPDF 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_off0000d5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 16924 bytes
SHA-256: ab1456592c47afd5366181ee9572f63cfbf58c7cf994ed67f22865743f764f9e
font_02_sfnt_off00011a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A02 10968 bytes
SHA-256: 79e3909993bbb6cb24428bf01df0a8907116175cc77be1650806d4f71452a55d

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