Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f8617c1989beeb…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 08:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 2d667391bf13da34e899b28b1790fd2f SHA-1: f45df164adf9f82a9f172360d2c11271a21b9a08 SHA-256: b6f8617c1989beeb47c53d4942388b7d2635971187384efd37c8266277928eb0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer, likely to facilitate further compromise or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gdfsztal.com/uploadfile/files/tenufarafunirumunokamos.pdf In PDF document text
    • http://dakov.hu/_user/file/pipuliridi.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/wojepebawujafegonuten.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/tasimobukaraxis.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6a6879343---35770001114.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/nexemenavunotejor.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/27845547121.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/sifisesuten.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/pijiwikowoz.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/xedulafatonidedadames.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/29662190653.pdfIn PDF document text
    • https://thepainter.asia/upload/files/ponukeditixujutupajev.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/32400576157.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/galuxew.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/87758368551.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/5637573589.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/xabaripegefev.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322e486b429---47866199276.pdfIn PDF document text
    • http://zuche0551.com/upload/file/belazid.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/32801916764.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0169f5c33b140f1d583bcfa6c1f516fd/rinamojolutilavabelevi.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613638c7bc3df---16669759435.pdfIn PDF document text
    • http://carbonelite.ru/file/54389345664.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/jipibix.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/23907496394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=shooting+games+under+100mbPDF 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_off0000e004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE004 17276 bytes
SHA-256: 622ad6bf1b96117f311002bab7cb30d2aebb6d1e22651392435097f768f0b255
font_01_sfnt_off00010ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BC 11136 bytes
SHA-256: c32d2f22181251fe5cac43af23633a8953ba285e770b85eb27a760869149e691

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