Malicious PDF — malware analysis report

Static analysis result for SHA-256 775e8d60fd670eee…

MALICIOUS

PDF

87.8 KB Created: 2021-08-13 06:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 105af63e31944d495f5f45e4461baccd SHA-1: 350f1560d091edb51a29320beca49372081cdb45 SHA-256: 775e8d60fd670eee77261a0055978ddbb61e0d6cf5b58dcfc9546cff8b6513aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/bd259b63fedfc48cf0ae94aec02c927c/63040946034.pdf In PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2217e2ece8---ruvefilabanivu.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/86097975618.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/tusigakulu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1be859c5b---48639724589.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c70fb9c4ee97ada9751716856e68b110/gapogilabojuvaf.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ff5bb22b36c4965bfabc7bd6022d5e71/88352510460.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/vnql8k8dqp6rt97n95srvn390o/44269576505.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/bivujed.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/9c354b5303eb80c1f7924061d81f9a97/30319063219.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f9da1f2dc---21366663006.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/9522433965.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/kizosilezunola.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/2678312216.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/mewanebulagamadurel.pdfIn PDF document text
    • http://abpaluso.com/upload/file/zubupitezejifulida.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/34386598489.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/nezufitimed.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608df9c811420---77811948686.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/deneleketobirubek.pdfIn PDF document text
    • http://salkim.com/userfiles/file/95492038434.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094e429eb47f---74140498862.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/49792992332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=download+contoh+rkas+sd+2019+format+excelPDF 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_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 16320 bytes
SHA-256: b629758d20fcba33f0dae1d8deee8c1d526915eb637b2600c06c547711a28207
font_01_sfnt_off00011b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13348 11392 bytes
SHA-256: f21da1e9207301e25fc0c27e8628d0a9722e948fde43979deb67c6a63e9b6f25