Malicious PDF — malware analysis report

Static analysis result for SHA-256 f69dd37c6b4105d9…

MALICIOUS

PDF

118.6 KB Created: 2021-07-02 09:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2fecfb4d27320015e92273de3cc1e615 SHA-1: 4f0f113e5e14088cda7de1463a72dec2292a8513 SHA-256: f69dd37c6b4105d9e98c74218363dd22472d87ca58337ae8916079b41ee5cdf5
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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 https://pistant.ru/uplcv?utm_term=all+characters+in+fnaf+sister+location PDF link annotation
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/9be1d7c0c24ca25c8f61b6b30863dc07/42937061133.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/1666082165.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a5ded650---57318256701.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/11f99bbe663d95a5e0c73a75df376428/fejanopi.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/97922058370.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a4454eede23---97202724183.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/c37hdro7v2l1ai7m4dui274uh4/16879300628.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6e8d42035---30290096002.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/vesuzamisalofilozibilim.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/2m67sg9849a8nnutn3t11opaqp/45378968400.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a354ab36d4c---dalawumetekarosozulilev.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2835a54e7---68098897896.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/i11to9buoimmsrndqgdbqhvlgq/sunexurilomedivad.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/4052086735.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609439152525c---pagavawomige.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f4a94647a---moranizobovisupozukomija.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/55945001824.pdfIn PDF document text
    • https://rajaunited.com/contents//files/7071253453.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb63e262db---nolafulakewemazopufobu.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/172206365907.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/8655290254.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/mejixonudakired.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/cgmrd7llffuf4s2vttkuklkc8g/93526490609.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/bb81f3cce2f2aabc7dd234956ad28fc3/46422464602.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/g3jq3fmjh4iommu91u1nia9485/98422001396.pdfIn PDF document text
    • https://lapdonline.org/file/39838896619.pdfIn PDF document text
    • 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_off00016f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F9B 17268 bytes
SHA-256: ced0d781f8d51e17ae93de65ddb2d1c204d212bcd25259bb47d60aaf93f1e925
font_01_sfnt_off00019d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B51D 10412 bytes
SHA-256: e58eada4e4daeb89f9cc95b22ea30fac094157031a9aee88f117219ec652ad0a