Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad98d1c478045cf8…

MALICIOUS

PDF

98.6 KB Created: 2021-07-16 05:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9b2d5450d65a455e92aff7ea9b83a8db SHA-1: 27cc0217c0f1cfd60974e62f6940689ff1246ff0 SHA-256: ad98d1c478045cf8b642b433f3414b908b038f414cac6164597a129f4b9745ff
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, with many URLs pointing to compromised WordPress installations or disposable hosting, suggesting an attempt to obscure the final destination. The embedded URLs likely serve as a lure to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b48e3b1ce---52857179741.pdf In PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/499e6e201415992601e0ae433848d379/49704487907.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833f82ab73b---64039765722.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/86844107654.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/78835513979.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/mepemigek.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609d34df5fc37---zorawurejudimulexo.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/440s0u6oou1a4dsu856ncis8uc/beses.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/valiwexogowudadosuzid.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13fd69fc69---97669335741.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/tuvokedom.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/36662823688.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/48657853145.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bba5e316b95---teworojix.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/sorojitamixexevopenaw.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/62276129837.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/57e59f6c4ac0a0c88abd693163a72966/zaboxixozusal.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/35f90098584a740ff2ed82bcac9f4f68/29292224365.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/bewijugub.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/e5eed8aaf94e365c320737b95956cf7b/66183207209.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16073d828080c9---64448914309.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/79930863648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=any+informal+letter+in+englishPDF 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_off00011fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000137f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F6 17216 bytes
SHA-256: 819ba363613e0aaf7bc25c9cbacb1a89ab264f5fa25579c87472bb6176755c9f
font_02_sfnt_off000164b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164B8 10756 bytes
SHA-256: 320a1e22c686c0b09977117bb71ab50800b3e24f9d3156118adaadb7b03d1b77

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