Malicious PDF — malware analysis report

Static analysis result for SHA-256 31552e203c154e49…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 00:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a8a44ba80495cb786b49a145f2a5bef5 SHA-1: 41f579fddac39b928952d73a464f1d6dc3243b4c SHA-256: 31552e203c154e4955a190e5455d2858b6a20175f5fceca3b3412403becbca0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate the presence of external URIs and link farms hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://coretry.ru/uplcv?utm_term=family+guy+123+movies PDF link annotation
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/21724515634.pdfIn PDF document text
    • http://dd-eng.com/files/files/38839728424.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/fegamubivodatiza.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/78012158537.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/24552287954.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/10644876898.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/445a4a8225f844378003d02502ec6d9d/25532052490.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/kewolinefujiwu.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/bozidupitaputosar.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161427e7f960c8---26305419817.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/48524323530.pdfIn PDF document text
    • http://uhorder.com/upload/files/tusuvumojiwiputulek.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/degip.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/webagubidipepovawezutajix.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/87254012355.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b7345fd13747e95b7304f0664cf1d07f/wonopajik.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/66344405419.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/63882762684.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/18788348001.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/noguvapirotupunipanekonaz.pdfIn PDF document text
    • http://www.pvvc.cz/files/nukazerelefib.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/84367565184.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/23937602986.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/nedomoweterixunup.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/89072850363.pdfIn PDF document text
    • 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_off0000cabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABC 17640 bytes
SHA-256: 9669b6ff21527262a36d3d58826710e27619f4816624b3ff9f3acb7358902f54
font_01_sfnt_off0000f858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 10748 bytes
SHA-256: d6c37d769daac3cd554d0fdac5089613d59ea916330948c29952380a452f3c2f
font_02_sfnt_off00011139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11139 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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