Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dfd97dd205ed807…

MALICIOUS

PDF

91.3 KB Created: 2021-07-02 18:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c62d2ea82619a5d0bb4d547381127ae1 SHA-1: 61f488cc28a9753ac0e60a6ff652d8ce481fa457 SHA-256: 3dfd97dd205ed8076e22d1529eec6d4815e15903074f82fb742729257398e28d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links as being on disposable hosting and potentially used for SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://garglob.ru/uplcv?utm_term=arcade+places+near+me+open
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c734eedfed2---12299014347.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609406c78fd88---bexadamokutakobar.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/18vatlcfjcbnj9i4vik9310seg/79029154964.pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/80961572997.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c575fbdda23---6035622336.pdf
    • https://mvpartners.be/images/uploadedimages/file/8327306085.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a743003d16f---robatorasisonokujenifofep.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/gifujaruzenepegigapizi.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a84700dd35f---zalukonamidutetifufu.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/77298007542.pdf
    • http://manavpublicschool.org/manav/userfiles/file/mirixi.pdf
    • https://arredamentigiacobbe.it/file/65489987547.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/cbb1efc12d31de901def98bbfa8ba5cb/25468278222.pdf
    • http://npas.ru/pic/file/53772309775.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c35ae5e508c---nalive.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ba052a85---37498355528.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f6c7378e6---73047960415.pdf
    • http://www.climatisur.com/ckfinder/userfiles/files/79968118638.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160aba496776da---nujoxipuwekatajipob.pdf
    • http://www.findvoters.com/userfiles/file/musaxa.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f550d8893f---85141965816.pdf
    • http://studiobardinisrl.com/userfiles/files/devuregotako.pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/27df45bac6a11a58f5c3bf02a5c3f527/73334708493.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010222.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10222 16792 bytes
font_01_sfnt_off00011a34.bin
99dbb034fc35ba220dde9906609ac3f976421609b8b71c1cf944c5bd4dfcf766
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A34 17556 bytes
font_02_sfnt_off00014813.bin
2120f34f6b45239e2b1caed2cca8e68f7c4aaec8de6ac0beff7835942bf791ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x14813 10468 bytes