Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c6250409fec04f…

MALICIOUS

PDF

95.0 KB Created: 2021-09-01 05:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 9f07e14050194caac1115548071b54f1 SHA-1: cd3998ecf4b2773dbbe17e934a4341e34bbec4d9 SHA-256: f2c6250409fec04fedb206e8b3e528896203c3633746af1c02727a44a89801b8
164 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/ccab3183d8b3f0cdbc1e2c23a9f65cf3/zemininuwifesofekiz.pdf In PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a95faf1efd5---96570483246.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/niberojidemafunaxoritep.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d6ac023de---jevalesasoku.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/vusizadejawi.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/ac3a4c3f58024fc3960e244e395d5bb4/72628490719.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/70dde8c5457bc6d0a6df9e20073440d2/77754234783.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/22273204450.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/50552491258.pdfIn PDF document text
    • https://somogyplusz.hu/files/96735144030.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/72008361688.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/wagovojew.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/36978868994.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/54139616928.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/8bfbe4209a7974ca1977b8e7c6d056e1/vuxedoxasuk.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/b30u5ci6bfr7okjlpv5glvvaqs/liwafobeviwinujik.pdfIn PDF document text
    • http://ddrwc.net/clients/869849/File/99173185329.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/fe8d2a123bf6ffed791e651026853cb1/44548023788.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/673c4ded1a24f44d5fd6030748f33678/samasalidiza.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8c7f4727187f756d50697855c71eaa7e/vutukiwa.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/45104820716.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/nekudedebomesis.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/58374764061.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/jusopijakulux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=kgf+chapter+2+online+freePDF 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_off00010b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9F 18808 bytes
SHA-256: 6fcf27bdf41aba57a3bca582deaa1aeb1728a0b6d603bf67df0a0ec59353e592
font_01_sfnt_off00013d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D56 10700 bytes
SHA-256: 436d149dfdb47607bd3358d0b98b2fde0434fd5aba1e27176806211820103e5d
font_02_sfnt_off000155e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1