Malicious PDF — malware analysis report

Static analysis result for SHA-256 2315ab42db72d77f…

MALICIOUS

PDF

86.5 KB Created: 2021-06-29 20:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: eb0d97b94e0e7dad663778f522006d74 SHA-1: 01df9834ef0bde1546a6432bf6574b3a1cecb90b SHA-256: 2315ab42db72d77f6df4688a49ecbb90c28ae87772e78b08d561f6d83200ea72
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many hosted on domains flagged as potentially compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is unreadable, but the heuristic firings point to a link farm designed to lure users to other malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://londonjip.com/userData/board/file/92799178272.pdf In PDF document text
    • https://magerp.org/upload/files/bodavosafaleliga.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/gtd37hb1av348gudfrenjtpnmh/bujetigumosulafoxifakexov.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/76c27180c6107c69e92b9ff9f57935c4/28910916756.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af63cc572c---valoranonat.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/8500958351.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ee5adc0bd6433b7a8ec695bc29bd5ee7/55081541311.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608008749211d---fanunutaviwufima.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/073257fc81e1a73097f7053640ba7e85/25219782805.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/niwesomezoliguluzukufujat.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/60823884600.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/56368791182.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/tuzogi.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/71746376065.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/6222792053.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/diberudowakin.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080211cd897e---bigure.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/32b05324175ef46ea0aacda94b998109/mabomitigi.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/23bac142f25549a0eaf035e33f909adc/jumefapilexaxekuw.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d14e81635d---49104707842.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/84537215971.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4886b0c30---22349453757.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/63b1d1acc12932988282300b6bfd9748/36942473648.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757ca71fefe---82574396352.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/datukogepomilepol.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/99767366528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=jee+previous+year+questions+chapter+wise+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_off0000ea5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 17576 bytes
SHA-256: ec14f69916cde717d4c4106e2601a49a194abc9f97a11940cf1a07d5352a8849
font_01_sfnt_off0001183b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183B 11172 bytes
SHA-256: 9668ca3d6aabc8e551d5123d5bb84fa18f325be2b45cb0bd1a39301a1ca5b93a
font_02_sfnt_off00013239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1