Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce3f706a4eb6464…

MALICIOUS

PDF

108.5 KB Created: 2021-09-24 07:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8c6939049f32b3130a50c704f4d28c0d SHA-1: 64e9a8a6466ad82f75868a2c1cc59d584785c433 SHA-256: 9ce3f706a4eb6464004df1fb01e0663132662fa4a3de24bd547aaf4ba2b00b6c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external resources. Several heuristics indicate that these links are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the overall structure points to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://artattack-concerts.de/files/file/66091084577.pdf In PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/muditarexasara.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/pidobona.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/wukojozijezerajitimevek.pdfIn PDF document text
    • https://betsin.org/userfiles/files/20722830948.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/35221102449.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/vge89cid8fnint7qeh4bc9hnt2/xosagexuvos.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137629f3e3c3---77788099879.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/4466845393.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/77951044506.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/ronumuferipawixejo.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/dobadovade.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/64556595366.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/zogeranuxomiz.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/papinevozetok.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/runojojumunisiwitizukuv.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/dupesul.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/89760080605.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/26040314165.pdfIn PDF document text
    • http://hejia-ele.net/upload/rifudikurenimobodododaj.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/5624264393.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc1769bfd7---jigozujo.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/56546642312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=indian+evidence+act+1872+bare+act+pdfPDF 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_off00014627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14627 10864 bytes
SHA-256: b61c317ae7b151bc85bbfeadce77accaa02ef8f859770036255b8508150c7853
font_01_sfnt_off00015f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001775f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1775F 17468 bytes
SHA-256: b00bb715e189ecd34c22649ec551ee2353277e74febc5d3b0d9cbb489fb98db6