Malicious PDF — malware analysis report

Static analysis result for SHA-256 6933d0b49ae0e14a…

MALICIOUS

PDF

89.0 KB Created: 2021-09-06 17:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 940b07a78f87403a5c657e6209c64693 SHA-1: 6ec971ecd6a4e3ef9ca28da2dd7c2f2ef5ee1594 SHA-256: 6933d0b49ae0e14ac9204d5077ad291fc7ec3a7ea8613fa47ea26453b90ed3c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a phishing or malware distribution lure. It contains a link farm pointing to various PDF files hosted on potentially compromised websites, and also includes embedded JavaScript. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely serves to further the malicious payload delivery or redirection, contributing to the overall attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bociany.sk/media/file/tugut.pdf In PDF document text
    • https://kawanmto.org/contents//files/76731733932.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/dorixavoxeforisi.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/34437212118.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/jewameg.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/632280628fe533114eb03bc4b709a9cc/85554945787.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/30282489449.pdfIn PDF document text
    • http://imi.vc/upload/files/fipiluvudijepopedetetusup.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/tujufobewawumiwot.pdfIn PDF document text
    • http://unsersohn.ch/images/file/kimimolup.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c04b4ce9d2---suzose.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/18529720941.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/fuved.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/fafulip.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/40201660432.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/gekufajozovemeviwokivis.pdfIn PDF document text
    • http://jucal.es/images/file/fobuvixolikekibegidum.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/1862014028.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160847f4112649---15342658080.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/wuxapepabalekatipozod.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160742bf0c5cdb---zekafebamoxugurer.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/kewelesefixazawoxivefux.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/8422776830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ghostscript+read+pdf+filePDF 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_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 18636 bytes
SHA-256: 31fab64788d7a7e64ec15cb2430a07b90dce2149d73f45f3496d1a27e4fd43cc
font_01_sfnt_off0001257b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D92 10652 bytes
SHA-256: 8a87352cdc815844968465da8a418754f16a98c0b64d2c715c8627dbe9656a3b

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