Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb20491516ec9d3…

MALICIOUS

PDF

71.7 KB Created: 2021-09-06 00:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 96941ec11be8cf197259fab5ca8fde42 SHA-1: 021d27089880d0336104313bccdcccb12a43b6af SHA-256: 2cb20491516ec9d36bc7ccddbc58427d1ce50044919d6db9a7b5001f5a653234
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as 'Pdf.Phishing.Trojan'. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The document also features a link farm with numerous external URLs, many hosted on potentially compromised or disposable domains, suggesting an attempt to lure users to malicious sites. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://minutemen-jrotc.com/clients/84940/File/38490922554.pdf In PDF document text
    • http://gramercy-grand.ru/files/file/36589591153.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/82960527589.pdfIn PDF document text
    • https://tepihtrava.rs//files/84199938957.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/194708804160db1c3b2aa81.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/4744480487.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609201db4bffa---96065502335.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/nalowiwokigewezizoniguzid.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/derirunapetijonenebazoto.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/folumufuderipufomimivij.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/49245949148.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/gubalowek.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc957572dd---3661758990.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098658766c57---14384887826.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/murewoxosivorevex.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/tojunanoxopuxased.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/pefobututopisi.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/0ele6udkn8n6bv3l0co0hqrb4l/bijurevenenud.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/61230016548.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/bc59ee2143632960568b5cac19a0b81f/wudowenegabubaselasubipa.pdfIn PDF document text
    • http://majcentrum.pl/user_uploads/file/buturonugifekatojutuminu.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/42f73520988ce92e6859150d64e896d9/2844595609.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/dcir85fqasq3l13ll8f641aic6/64033093595.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/nowavugig.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/1687479296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=suunto+d4i+user+manualPDF 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_off0000b50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50C 10664 bytes
SHA-256: 3eebafe21cecee6ced1bbf9e3523213256458f97d8a1bbd22fcc86bed6524111
font_01_sfnt_off0000cd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE597 17616 bytes
SHA-256: cfb5a17f4db4c23a5b584c7ec8f3b97a9c0880dddce9b15199add82203ae40f6