Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c8ee1ab513aac4…

MALICIOUS

PDF

92.8 KB Created: 2021-08-11 20:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bde83ef6b96929c0dc82a8f315ef3cc1 SHA-1: 519900548f03a46730ccc97dadbc95b2c013f367 SHA-256: 39c8ee1ab513aac4e92429996848ee890cc4e7a1a91f6fdead732028fe799b2a
156 Risk Score

Malware Insights

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

The 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 WordPress uploads and other potentially malicious URLs. The PDF structure and embedded links suggest it is used to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://primax.fr/wp-content/plugins/super-forms/uploads/php/files/n807aqlrkrbm6ikk0jho60c777/962334429.pdf In PDF document text
    • http://thehonourride.com/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/1807093255.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16071a88db313d---78787286222.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/5477d69b8ce57f0057c860f2bd501ebf/gefuluzexefojun.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/befodaragajeroxadukenuzej.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210805_12B23D3C615074DA.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/bovesupefoz.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6c1eae017---13248014424.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/29659241672.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/3f540648021359a50447da03c95708fe/pugotewog.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160706065586fa---dubivamomula.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160928c4c9da14---48219068444.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/f812650c999020f4bb52a2cba6a9525b/1241879498.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16109f7ed7a16b---90748096473.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/gopabatimuba.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2cde9c95e---44623704334.pdfIn PDF document text
    • https://digireg.cz/upload/16964493088.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a8fb037e68b005782524c0570640e21c/dijamarajomomof.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/40595177670.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/0116a77d94026695fcc058eabed089fd/dogatuzinojijagipezam.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/85486578577.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/nadoxuzofujuziv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=suprabhatam+mp3+free+download+ms+subbulakshmiPDF 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_off00010530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D42 17156 bytes
SHA-256: 3758b06efc96a719c8ee62c85f9d03253de9183e1de14a596fbb9ff60dcb9763
font_02_sfnt_off00014a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2D 11428 bytes
SHA-256: 72af97b65e66b5510bec7669db85c9ce1f8355c4acad006f3840d4b36a82c343

Open this report in the interactive analyzer, or submit your own file for analysis.