Malicious PDF — malware analysis report

Static analysis result for SHA-256 267799d17f33a0ec…

MALICIOUS

PDF

89.3 KB Created: 2021-09-18 16:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ca8bc305acace4e85892bb65b97c84e1 SHA-1: 583a08e5c614129c7868a89d07eb1531830b9b29 SHA-256: 267799d17f33a0ec5cd536d1b3cc2fd69f5133d71519650f5790dc548f8432ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://shangrilayunnan.com/ckfinder/userfiles/files/41972980271.pdf In PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/todokavegutumaxudibu.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/18130572785.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/xupuvudipov.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/fajinowodo.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/tosagewa.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/41e2d90f20ca784cb2c676491e1450ae/pubapufa.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/miguladisozegapunixelufe.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/eda32de7638f1b98c1d63e69b4908d36/gesugusinuwabenokosove.pdfIn PDF document text
    • http://webs123.com/userfiles/file/29509097928.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/tovozorefemo.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/finutoropa.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/86989188784.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/vaveb.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/xawewudazutivu.pdfIn PDF document text
    • http://qwerty.pl/_data/file/felekogibu.pdfIn PDF document text
    • http://master-vin.ru/files/file/95815297255.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/31098960879.pdfIn PDF document text
    • https://slotsonline.ro/app/webroot/files/userfiles/files/fojeguxadewimozuvet.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/7049493faad4dc553d70096039c49102/duterisuxowinaxokif.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/70589326027.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/difuwodixigamajofibanotel.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/23404090922.pdfIn PDF document text
    • http://355353.ru/userfiles/file/salotenalu.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/wekitas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=otter+voice+meeting+notes+premium+apkPDF 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_off0000f3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 10956 bytes
SHA-256: fb6a33ecbb7d0f972914cef9ada7dc5257a92b522b1f0eea2bda09d1d4c20092
font_01_sfnt_off00010d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12570 19232 bytes
SHA-256: 4b6501b876917ed4b9eb5e574cb9351c33bc5210d497e8c67ae6e3fd553ed69e

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