Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17f8c56ecc9af25…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 23:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ba0e4010e0d8ce229cd1714372b05ca9 SHA-1: a762ebe48a030cd51b384dbc3b80bd29040b5212 SHA-256: a17f8c56ecc9af25f422cf934cb4bfad58e6492cc673d3bfb9aefee94229bf95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://krisoc.ru/uplcv?utm_term=contact+lens+conjunctivitis PDF link annotation
    • https://guineaservicesproviders.com/gsp/files/67111360543.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/7f78abe68d8920735f6e4ccd6129a785/medolujotote.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ffa596bbfdf---29912580293.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/e470653169eea9f92913b2cf6790cff5/voxaxaruluritifina.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072f998ebe33---72482774847.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/fejatolutadenujibawexep.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/mujewaluvusevedum.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160df62d37c980---10655377804.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0b1d48b22ce51dac6cf9d9a8a14a9d4c/feverokebixufuzaf.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/xiwuzobebozeguregiwatos.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e708c117b22eca0e653eeac7a7eefa50/kafexoxovazav.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/repuxan.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/e80632582d1a17685ee25b85095fdc12/99753488954.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609aef8b00dcd---tojegopanafi.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/71091318341.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/c21881f2390fd1c2d6fb1b9589acd622/niluxegupetabix.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8caf78590---xenet.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///15231414316.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b1c81e176778f5c838e0e6f047386a8b/81348193235.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a7f167de3---dozex.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/f739843b766848ac5cb326f0c6e4cbb5/ritedulap.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/kegisosujomuzatunajilut.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_off0000e502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 18284 bytes
SHA-256: 667812f327d04d121e5b1e432d7aaa5b6b607d6bdcf480c9ec7ad8be34743b24
font_01_sfnt_off00011487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11487 10448 bytes
SHA-256: e5e9562c74a6c08823cde19a86e255610dcee3c9f5b4770690d6eb6ccb45e44a
font_02_sfnt_off00012c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.