Malicious PDF — malware analysis report

Static analysis result for SHA-256 12af89ca0686c833…

MALICIOUS

PDF

89.3 KB Created: 2021-09-15 20:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4868fa4623db16642de17f01059fbcf3 SHA-1: 78b725db5a38ebf1eac27cf6efc40ff362ffeedd SHA-256: 12af89ca0686c833601fe2043f6c97065dbf5afa2bbf6eb735c9e7f25dcb27ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to multiple compromised WordPress sites and other domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous URLs, many hosted on potentially compromised or disposable domains, indicates a strong intent to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.jindatunnel.com/up_files/file/golikisuzam.pdf In PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/gotobunotijarotanurix.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/19457613957.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/vasidakivexagejutinupigoj.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318e2a9f2f1---kanuzadulezevefese.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/tupuvasaledosapuzufojux.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/24093138804.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab8e1576d966d851394a35993d5f465b/81616791203.pdfIn PDF document text
    • https://songhongresort.com/img/files/1881482352.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2lo4vilc2f21b2a9vfa2dlqq6d/xatamogisovubifaz.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/rotejuvudowigup.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/7473578386.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/bawibekosafin.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/gogerixinupulagebabugi.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/974d455906281744e73963d5a56b474e/75239493419.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/35437851612.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/kevojirirulorasodibeji.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210908/16310535115966.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161355a94db01f---zifijodokemedumimegoke.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/6647664644.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed20cc3422---17423565569.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/vinonasuderategovezipoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+dark+fields+pdfPDF 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_off0000fa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001121a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121A 17888 bytes
SHA-256: be51453bf9d33f2cb8d736fc261cd2e9dea244706a0806396f7c431286bb043e
font_02_sfnt_off000140eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EB 10328 bytes
SHA-256: c4542c038fe22287a29c1e2ccbcfe00393fecf4e53681f927e2cbbf8a446d8d3