Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d77facc2faad6f…

MALICIOUS

PDF

90.9 KB Created: 2021-08-03 23:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: aafec99a93afcbfcc035d8623e242e68 SHA-1: b5fecef550b9f866fe207391a81ed7a4bb9ac622 SHA-256: f6d77facc2faad6fd965dd3519a3cd150c7e32e21cd6727d46839ac6634e9427
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a lure or redirect mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic findings suggest it's designed to deliver malicious content or phishing pages, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=exercicios+de+regencia+verbal+com+gabarito PDF link annotation
    • http://mobilesamara.com/img/files/file/21403184357.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4d2e5e53568ebed678bfbaeab3c4932a/41643067689.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/d48142112d24e1a9f9b29bcee90ee259/kuzubezozi.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a9a74e5e5---kabalo.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/mulexokupep.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/dokozijumitelurabap.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/da8a43238bec6632d201f587fcf0f20c/30524074132.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/fd164a2b745334e1701e53486ab8ed2d/3755566709.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/83475900678.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/18291551711.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff0ec5915a---rovige.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/pafes.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7fb5c33e9---vizoxaxijapetafonoku.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/29882082475.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/21932518322.pdfIn PDF document text
    • http://ippon.lv/uploads/File/vofexofeliwomarakakota.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b65f72912b6.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160cac76757ba7---84785620124.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/j21073an7bjkmmloaes5st3ft3/39765827731.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/xidowegurizanokesujet.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/lokovezonomaxire.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c551f8bf883---jadesedozadosef.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/bdgc403f2dpgbj40oqv4t9redo/julubotunanejeronana.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/19109467587.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_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 11004 bytes
SHA-256: 820f0cd3e935dd4a5fbc4ec4a4287aac5571281e5904b5c522764dddcce5b05a
font_01_sfnt_off0001141b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2D 19708 bytes
SHA-256: 67528e761180ea0f36c37654fbd0f2c100bc2f567e11dceef90e14c9e67c84c3

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