Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d0e169fe2c97b6…

MALICIOUS

PDF

83.5 KB Created: 2021-08-18 16:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 149fa2eb4b112d30d04df818413f5234 SHA-1: 665a1475882f598db45adb590ee7457303a2f151 SHA-256: 35d0e169fe2c97b61fa5761589a444efd941e6599984fb1d9fd4b0d1df8377c3
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://osoboebludo.com/ckfinder/userfiles/files/58235179639.pdf In PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0083b819be---39950422723.pdfIn PDF document text
    • https://lecapsuledigian.it/file/vobakapesikiziguziguxi.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091d4826b504---57250754126.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2ada5e060---26580670862.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/11699086167.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106631345844---87712528577.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2e2ba8a44b2e1a8fe776b0372c4fff6b/62508363056.pdfIn PDF document text
    • http://goref.ru/files/file/80122576169.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/61836964766.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210710_99B09F4036DE6797.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ge3vd5q4kcq7ju8lkevudlrjsf/faramopesifujiwox.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/h78hal7t8d80nrer64coh40v1u/fafofeniwigekevux.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2t0ig7ff21tdb65dklkmies414/52880881746.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/duxatedixebanuwemap.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609166b344477---4253085043.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/63059602159.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/magujasejuwaburadapeta.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/fapavukonogomogesi.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/51400586261.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/xojuki.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/memaz.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/xiwifuwagiwoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=bbg+2.0+week+23+mondayPDF 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_off0000e12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12B 17332 bytes
SHA-256: a8d9c0f6064d39e9e804890bf48a6923e485efb501dcc13b952e812ea29e36ac
font_01_sfnt_off00010e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A8 11052 bytes
SHA-256: f11246b5347cf568e2bba556c0d8be018bc94378090561c5b800316d56a5ae03