Malicious PDF — malware analysis report

Static analysis result for SHA-256 793d0d70dd5ffcd3…

MALICIOUS

PDF

91.3 KB Created: 2021-07-20 13:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6fdf066cd61a9504a38296a8f322fdbd SHA-1: 7aae6ecb662dd76693aa449b144b6de92c39c0bd SHA-256: 793d0d70dd5ffcd37ddbd9611cf35335a62622faaead8047eb1dfd4e82e09948
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078902ff18df---89099459177.pdf In PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e7db239df02---murivigeperunozi.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b67dc85e638ca88720b6c97abc63db04/raninulelevovak.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3bd0212b6---tasibisesekajosuvuremako.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/70096424862.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/4ded4698e243e5a5598c9774411a9983/nadaruza.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/831f7fcc8a87469fcd94051793e46efd/7641547228.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/18378912943.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/571d22e0c11bb8ce356d0a22d5ce77b9/fejoxopenapogidujaw.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/dozol.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160bb107ad7922---84195445239.pdfIn PDF document text
    • https://clove7.com/userfiles/file/gigeguwapibofa.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a2479f362---28244535708.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/saxet.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/94694554690.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/cdd39a9bd27b73250339282cab6b36eb/zapuvijikimufisinafodosej.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/ee246a219ad072d771749b8c61ed3ab2/70741379038.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/hdh6bfarl6rhmpoi66kj7cfpq3/sizexatemadej.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/ec340594155140f4b4e099d8cc6826f1/wutexuvarutawuwe.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/kipenosogumu.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3f8658b9ff4399881651d9a420d7e6e2/nusajumepavinixutazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+have+a+flat+stomach+fastPDF 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_off000100a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B4 18292 bytes
SHA-256: 8bf2745b07b6d5547bf8f4f63d0812b498ddbd5c14b45198474c63233f2b93a4
font_02_sfnt_off00014931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14931 10448 bytes
SHA-256: a6fe12ac910489ec0c4072dceafb33038e230150f8e993ca65ad2b8a91864a54

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