Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdcbd51099d57d9…

MALICIOUS

PDF

84.9 KB Created: 2021-07-20 12:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e69f1e9d995c11a07bcc0d0528e6d285 SHA-1: afb99ec8d4c9ee4a34d1ad95b1e72bd3a41c1789 SHA-256: ecdcbd51099d57d90dab622c2faf907db627660ec249f1094ac5b0eb0f00af24
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a social-engineering lure. Heuristics indicate a malformed exploit stream and a link farm pointing to compromised CMS uploads, suggesting an attempt to deliver a payload or phish credentials. The document body is heavily obfuscated, but the 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the intent is to trick the user into installing malicious software disguised as a browser update or extension.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/7bd18ac6f1819436cea6f8a4b890dc33/juzawawag.pdf In PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa40599aef4---5197654045.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095dd1970ff3---tadinebudulakaxitel.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/9ddktps0q9v1kam50k7gs4k3pm/zibarazazejosuduk.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/zigaduvomapexal.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/48e97bdm3nnbvfr391fstqarig/75779677284.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/tenugudafowomefonumod.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5c54875a3---71219000108.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608825719dd05---34924878919.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/nupewozojiboj.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/3ip2a954pi5758tjncqkovaiu4/zobawogifimetekeboja.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/48380605788.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae458ca8c25---91335040376.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/sikurekudititabotulowo.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/loxuguzepokolumotobenu.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d14e5a114e---rujitubiliniwexogagarol.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bcb389e67---13427845154.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/rematisaj.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/47590392828.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/mupoku.pdfIn PDF document text
    • https://nevisnews.com/userfiles/7492403322.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/90s2ori7kkl7eps6t952um6f2n/45204728465.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/kimibuxoral.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/moramimurutan.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbcdc6b1b7---560056167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=learn+html+and+css+pdf+downloadPDF 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_off0000e9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DF 16648 bytes
SHA-256: 9308a39af260c5ac8efabccc73e7fcca83b5151ee580c3b278f5e37fca3e0e7a
font_01_sfnt_off00011555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11555 10836 bytes
SHA-256: 49d04df533159da31b1150893a121512a9f8ae624a9b07f18738b97c503607ec
font_02_sfnt_off00012e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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