Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17d99ca54dc1f1a…

MALICIOUS

PDF

129.2 KB Created: 2021-07-07 01:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4dae772cb2c5e32322db47b9dba809d3 SHA-1: b4f91e96a8c407e7727b500cea49d46582c123c8 SHA-256: f17d99ca54dc1f1ab1cfb7751403a57e69a9a2817b91b2360ddedd5208208c3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://speed-r.com/js/upload/files/21087703328.pdf In PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/9409ebb67a900828d65e6e594b2efade/51075208380.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/86157489902.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/9d49af2ec6ca38e72fcaccab2f61211e/jojupe.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c993d271b4---muzixagazamojalef.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/senibesuxibuta.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d37659c360b---ridavu.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/nbtbijecg0sbunuu61a9cofsra/27589002698.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/d3f8837ded5f81889b9fd93f2aa34b64/76508705671.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/991q4nl1v9g6vv0g8ar67j6gl3/dekudobulaxajixitepe.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/wagatal.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c89b580b33761f4ae2d5a1fc473c94a8/61127738741.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b041b1ae8e8---18374221846.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/0kssvau01k45b309cs94mc5ve6/firepal.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/3e7e7e34b6c83ff8402f0a68fb0e59b2/sifuvuluburex.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b979ac2a897---sutivagonotowi.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/risesixurepagoxiradigeraf.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/78956158104.pdfIn PDF document text
    • http://mosjob.ru/images/file/94895539827.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/sius39tp2i10p3a6u9ri2ov7o5/pisadexitodawun.pdfIn PDF document text
    • http://chikatere.com/Upload/files/rakasawafizetawet.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079dd923fbcc---83433399059.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/rofp5s9td9rn2amddesbv2nos5/barujapasos.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/mudotalagukomi.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/74331355281.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609114023b280---bofegudunifo.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/wetikakogojuzelefolegud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=arbitration+in+labour+disputesPDF 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_off000199b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199B5 10608 bytes
SHA-256: 6fa01d0d419bd25bb09d48ab5bcb764e0163d8c1fe71a5e3555de16a5cd5ca21
font_01_sfnt_off0001b1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9E7 17296 bytes
SHA-256: d6ae37a05669dbbca5621d6bdceb6b117fff676139fc03d8ef19dcb4fa6ed766

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