Malicious PDF — malware analysis report

Static analysis result for SHA-256 9618f237328ffc47…

MALICIOUS

PDF

93.2 KB Created: 2021-08-25 20:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ff90efacf2efbe61c3b5a4482dbfebf9 SHA-1: fb7c226d177a5eeee2ea217e9820d46691e4d754 SHA-256: 9618f237328ffc478a88585d24b9888e52c28d382fcf57009eb80a016d57b411
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sun-tes.ru/files/file/pisik.pdf In PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc6e2982ac---10391144635.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609da380d7702---10996782965.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a7b8b8c5b94c2f937bf4a3a935935f6/malipazalatajuwor.pdfIn PDF document text
    • http://budka39.ru/files/11892159393.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/71802276874.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084088667915---59492427165.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/51cd0acd427964f0d83f84560402884e/44422241617.pdfIn PDF document text
    • https://soechi.net/userfiles/file/migasomitapumutoduduzuniz.pdfIn PDF document text
    • http://ipllaser.in/uploads/lekedoxu.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eec832ac8---79493000654.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/suxagajukejaguzumofa.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607847b1bc607---naduwutalusiz.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093393c811a3---rumigafipakuri.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f5a27c8688ac6ca10bee7726d28bc018/tizadiku.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7e4fbe01107c34e5087dd1b4a41c5b36/76081737482.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/25447077131.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/70003119911.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a306c53f229---samaben.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/cojsdjfqml98uh2pcb0tihrglr/28503660275.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/64977099267.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/sesemefafalumesesego.pdfIn PDF document text
    • https://premium-house.uz/images/file/xeguvumifisibojojip.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/e1b357ee8852725eccbe6e82c9a27b0d/21846163008.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/najuxagipebuse.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///3759960660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=trading+goods+and+services+without+moneyPDF 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_off0001073f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073F 11100 bytes
SHA-256: da5fcfd9cfc62807cb87059f131ed564aa5cfb0a43343d93cab723fbc8b4aa0a
font_01_sfnt_off000120d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D1 17460 bytes
SHA-256: 422c4ab44f8d212703329a12903ebd81fb8d2a379742ed0fb7a84bac968dc4c9
font_02_sfnt_off00014e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1