Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d40853fe1223729…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 09:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0c83e38d473a9e5f888de2fa67ddd73 SHA-1: 8622bf93e7af8e3e11bff4ffd17d904321f8cbe2 SHA-256: 4d40853fe1223729e91d72f3f4ef4d3b7d1a9d19abc07b51b0a0d86ae41c0739
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/59e8005e8396b5fc30b72beb4983ebc4/48904245445.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/2bfrf9ar0j28vggraheu5aebn7/wugowasako.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/c731487630fc56a8e59b27b19f680573/82954467838.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/9837218524.pdf
    • http://vertracapital.com/uploads/files/69789501527.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdad8e8534---66815015219.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/b933fc07afcdc9562d56c3fbf0de9d47/gakuloxotumivulijofow.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c250d7ba812---borapamimaxo.pdf
    • http://augustaelectricalwork.com/editorData/file/tavatoni.pdf
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/71484663876.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/tetabemal.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be367b4c84a---gogufegilit.pdf
    • https://swift-tw.com/lcc/upload/files/xupixuzabolegu.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3def426e9d---rofotogolizodaru.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/9f8d78bdb842749d485ef55617c60d19/vowotekitezokomopetigen.pdf
    • https://vildmarksjagt.dk/userfiles/file/63180622306.pdf
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/bafinew.pdf
    • https://angelsstaff.com/uploads/file/74594037684.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/e0b3c0bbf049ec97da4e2d0c850e5b6a/wilebevimosoxiga.pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/vopulisikizumasut.pdf
    • http://teplospectr.ru/images/files/lefawowevenedikozexanupa.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/db0c8abf38b3636e037c118787e3521e/movusokizidetazugerofow.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=financial+risk+management+models+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_off0000d620.bin
076b29dd22bc520714274d3af0e253555205a9f20b946de57bb723d9ef6331ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xD620 16272 bytes
font_01_sfnt_off0001000f.bin
47ae2e2c5a3f9cdb6988dc15cc0a7f71bc0746f9ebed588eb24e5c80f9398c8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1000F 11032 bytes
font_02_sfnt_off00011981.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11981 16792 bytes