Malicious PDF — malware analysis report

Static analysis result for SHA-256 584fb06ad390657d…

MALICIOUS

PDF

92.5 KB Created: 2021-10-23 19:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 70622c4bd533ce9945042ece82623ad0 SHA-1: d1e64277168e878fae995b31c6b50cb2ece355a2 SHA-256: 584fb06ad390657de6cf17a3799dfdbf87250089c6473dadca4c4906288851b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to various external PDF files hosted on potentially compromised websites, suggesting an attempt to distribute further malicious content or conduct phishing. The presence of embedded JavaScript indicates an intent to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • 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://comlark.ru/userfiles/files/jejapixiretizigujovope.pdf In PDF document text
    • https://nilsahost.com/calisma2/files/uploads/bilik.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/mituxifuj.pdfIn PDF document text
    • http://findusafranchise.com/files/files/pusejoveb.pdfIn PDF document text
    • https://gmt.twwebmarket.com/ckfinder/userfiles/files/76617052679.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/832ed6338176b634ae4809fc3585542a/ruveguduwatujarananige.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/15989985224.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/fikirujuwimebetiboxofa.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/30691808016.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd2edef235---xelozizelopaneforabavonos.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/ddd2c9adca5e8697720259d8701b60f4/pupesenowefisamuw.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c33c3ab072---votaximima.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/68709927936.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/sazij.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9j0t0u3m9sb88cmnnc4lmmsisj/96838910353.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/jolat.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/34796873726.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/puvosesa.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/78942257301.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/rusufimejab.pdfIn PDF document text
    • http://wjcopy.com/upload/files/jivoxosetevozujojumalar.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/werurodufunamaxuniwazew.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/UsNeCLCzgYg/uplcv?utm_term=performance+interview+questions+and+answersPDF 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_off00010313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10313 10988 bytes
SHA-256: 0adfb9b990f0500db5d63ce14f2b123fe2e6c945fae7e5a9acb2cef54c8a28b4
font_01_sfnt_off00011c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C79 18268 bytes
SHA-256: 6517acc6f7123bb09eed6b08c5e35bdf63bc267c1ab1408c875d32959bbc77d0
font_02_sfnt_off00014c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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