Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d436ca3895ba7d…

MALICIOUS

PDF

88.9 KB Created: 2021-07-02 22:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b404a6ed52cb37d9628bf292bb11091c SHA-1: 88b95a971d11b0aab7c337389b27c218d7a0139a SHA-256: d6d436ca3895ba7dca6c0996fd8df46daa72f53dd6ca2cea133ef6e299659a28
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ccd7261013029a2a054cf9eab10b4b73/16423295088.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/sowuzipapotafaz.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/4142f406cf5a1cd3c5dcff334aa07747/38753570077.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/47424241750.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/59390507482.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/e0dd957f5f83b881a1d29d668de40c28/43309469272.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f82d8fa16---pagukupiregazuvuda.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8b1ff855fc267b9d0383a4750f5ebeb3/57333686391.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6d59c04b8---49898749946.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fc2838809---bovobexotusobamivas.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/jnmq0ac46njmpf8qpfhs9gc38m/jufuxogufekesera.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/mq7pn5h2s18kg3vleo5m34u1vq/35389831436.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/gubadepujetiwuju.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/57803257086.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bamefagegef.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/nipewamuxefasetuvudi.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b4e67b369---tuturisi.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a862566eb5c---28448623015.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/zowipufavowulejelo.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/51981481017.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722fba25965---61952699047.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/t4b2h4kblf2qdkrh4b6rr2ltig/85565032742.pdfIn PDF document text
    • http://gtshotel.it/images/file/kodamumeviwajirinudiroki.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe33cdedb9---patowodizipekexobiguse.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdb4bca609---tonedakabebuzeko.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac01d286295---63088464263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=12+pst+to+bstPDF 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_off0000f906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11118 18280 bytes
SHA-256: b7b186b2bb4928d328ac5d40afdb5707c2769da479784bc31cddce5bb50e6d9a
font_02_sfnt_off000140f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F9 9824 bytes
SHA-256: 8e89a5a2c611dd4f181d433dacdf52877b4f5c2add01bc0e08f8fcb25e8b29ce