Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6293f757cf03e8…

MALICIOUS

PDF

95.6 KB Created: 2021-06-29 05:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: da47346a923e9e7c7f545d6aa26cc3a2 SHA-1: 48dc0cca15dcd7c4f094cdb4d3a8f4993d45d003 SHA-256: 0f6293f757cf03e80eae2d45c19fa58cd5f46c903f3bec4764d0aeb70080ffbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16083841be43ad---892194606.pdf In PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/fulozemipowasesukasif.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/bukufutudomajepozizenaxa.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/duxovatokobir.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e2c6328f---16996615122.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/395874604.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834e75a98ff---ravepepinusosatufifaf.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dda27759e7---49975853592.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f802cc73c---50602625961.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/15856999736.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609828651b370---63319674523.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866f6c92691---17548562667.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/3cf8ef52a8cfdda82ce0ba760e83a82e/punilutevutebezugomujeze.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/gr4dme21tovjhbept2irop7qc3/12771107371.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3a6511202---lakufipowonomobezajake.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc03c4199d---86418199598.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/13962789747.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c349db4a5b1---lomolesaj.pdfIn PDF document text
    • http://minerva-collection.net/files/files/7782656745.pdfIn PDF document text
    • https://plasy.com/uploads/file/remowarilemubojokuworad.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/21828844545.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/5ef1e5be1b7a6aebcd08668de571dff4/tizejiwijolobigopigit.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160832603cf43c---jifen.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/hj6osaq95m4vd9frelip0a5rld/42735838613.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/04a12ffc6956e603093f5302c591c49d/xovebujamo.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/18205973747.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a5f00f42d8bf65be57759bac782f39dc/43958342236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pain+and+dryness+in+throatPDF 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_off00011215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11215 17472 bytes
SHA-256: a4e8cd1e3a8d6b6366a0de1b1722e3c33acba4d7130cfc2f6453a0312627d726
font_01_sfnt_off00013f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F90 10416 bytes
SHA-256: 8a8684e8bc04db1f5a85e9014bb5480a72f76f11710b153937460ea6be276ce2
font_02_sfnt_off00015720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1