Malicious PDF — malware analysis report

Static analysis result for SHA-256 adaf891de14aa8bb…

MALICIOUS

PDF

67.9 KB Created: 2021-09-03 16:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7804616605ab5edbf04c3721ee47df1e SHA-1: 996dbe6d2581acbabc85e153e590a6ee43e32c4d SHA-256: adaf891de14aa8bbd54995af644d08e93925501fba710fc5087b9e6e58cb1a78
154 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5990

Heuristics 5

  • 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
  • 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://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d636b71370---rizagemapa.pdf In PDF document text
    • http://bhk-aindling.com/userfiles/files/55669797610.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/3b41a6d470a927b4d4d7af8fc732634d/12806568946.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/89205303916.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/fe56a26ff42fcc0e5f117c9a2bd2f582/lijutopesaja.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/34011974962.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c598ffea3e0---vopujivuvigasewapif.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/mixomubelagifeti.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ada810e374e---12021882259.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/r70i7k4fivl6f93otj8kd4ksd1/legumotedotirujuz.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e88c8bf3b60---vufejivumexem.pdfIn PDF document text
    • https://europartner2.pl/uploads/85333376973.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2745c3499c---52030756613.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6afcc0515b---wijapavuketutotudupakel.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/nazizomodunexixalimolu.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a753ae5a22445af4ec561617b759effb/22349900485.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/lonizesodunavoxuvexom.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd80c05cda---82055162332.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/tepomesu.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86084125714.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/40322966905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mesalamine+davis+drug+guide+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07E 10780 bytes
SHA-256: a5fdd86024cde3d2f0481d56d68d2842d40ea062056d22854d190dcf8b5091aa
font_01_sfnt_off0000d908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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