Malicious PDF — malware analysis report

Static analysis result for SHA-256 50550b3fd2024ce7…

MALICIOUS

PDF

82.0 KB Created: 2021-08-21 17:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e7d06eb6b99d4b8080032d3838afa3f1 SHA-1: ffc03eb7c130f5132f2d30db3cce527d7025016d SHA-256: 50550b3fd2024ce765eb3ed796930043fe1558b4deb3ef2d1c97922f1a1eb930
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=english+to+hindi+vocabulary+pdf+free+download PDF link annotation
    • http://marinapogon.pl/upload/file/jibegufejenoladefozebabuj.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/zaturepuvu.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/30602981202.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/lidojapurumonenamufoli.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6919c5f89d---vizolopudavodebiwogapu.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd97e937d9d---fifotupafoxokofumijipuwe.pdfIn PDF document text
    • http://parfumkin.ru/files/files/83676094312.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c842b9e68d11bdbe182669001ec6084b/22601547934.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/fb48f0f0d17d5c358862425a1d861361/gezabubigufogudonijuno.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/a23f111bb4bb057979fdd199bd11aea8/51009707027.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/88521213578.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/mukivimuleke.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/osl8rcfvjsshvpt9mss9vjngus/51456135686.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609923c5b5c54---wururojesafuripovabil.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912c2299933---5841525299.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/66894840777.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/dinesudavusi.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855b475c71c---66244653382.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/qp7rhjre6osi3s3jahc09j80ji/pupozatunisomebupo.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/93849616888.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/lejusajokizorekonebo.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609109cc6810a---74528197811.pdfIn PDF document text
    • https://iohrp.org/f_files/files/jomukafejivovevomo.pdfIn PDF document text
    • http://master-br.ru/img/file/lamemumotukifireroxim.pdfIn PDF document text
    • http://houselandia.ru/files/kujogu.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_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 11388 bytes
SHA-256: 4e0a5f90424b78e2078d7d23c5f64f209ca9a772756fb7240b2360f2bfc6aa4d
font_02_sfnt_off00010ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECE 16548 bytes
SHA-256: f5af910a2a3bb2c96d0a10c730e14d5dab5f5807f08b5fcd5f122912d8dcbe29

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