Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af66f5cdce7f66d…

MALICIOUS

PDF

91.2 KB Created: 2021-07-21 04:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 58e8b35f675c0569148c4f36c79bd5ff SHA-1: ce69552c3e5f574a32d55a3938c81630022ebead SHA-256: 0af66f5cdce7f66d28a522f5a3f9e88a1d1d68e3cd99b8a8c03b97a30188d218
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The file's structure and link farm behavior align with common techniques used to lure victims into downloading or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/pf6c18afvga85lq4qp97g7rc9t/faniviv.pdf In PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e2b83ed9bb4---63328030650.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/ef2a69d9a6632b10b2a55fea70566f89/lawefixubamojoledelaseso.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5c854520---55538161965.pdfIn PDF document text
    • http://temple.mo/userfiles/file/82186130420.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/vuxezolawuvase.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/395dd21d71edd71238885e30b7b7204d/75310609349.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/14065500c6985d45cecb0c64b9bca670/44744257580.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/junmpjuh5lev5ql7c87pmnba37/wipugapemabimovukofu.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/39866703911.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/gadutogepudesofosukatu.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/kudokejijimosevoxojijuwe.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae53497570c---14271443819.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c436d88db---wedekojar.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1bd9acd38b82965e14b8fbe26bc51017/48151948798.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/budewovawedijejuzo.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/gurigotibelururufa.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/rezeso.pdfIn PDF document text
    • http://airfa.it/userfiles/file/xerelikururikaj.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a59c69828c---6636791952.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/24/file/20210624_102618_194.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/de679962b59c93dccc106c388c15eaaf/desajifenilosoxipovot.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/ba60945afaf678129476dbf21d5fb78d/20543800403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=caught+lying+in+courtPDF 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_off0001031a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2C 17304 bytes
SHA-256: 107ebc0e6c1531a5efca535e748028b17977754e5cc29f13353ee640cb3a83b9
font_02_sfnt_off0001483c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1483C 10452 bytes
SHA-256: a44e24a57b7425c79c50472515e62a3acc5a5069d669051df187e8eae6d4b064

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