Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1373c7252b5113…

MALICIOUS

PDF

65.1 KB Created: 2021-09-17 23:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad0af7faef64d65f7f11673bac52abd2 SHA-1: c1dcd25e4b053bef38b525875087d65f6d34e9bf SHA-256: be1373c7252b51131f82b5ba8014528a85a81d92b06fe395fc7eec08be4c5f35
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links to compromised websites, including those hosted on WordPress upload storage, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9127

Heuristics 6

  • 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
  • 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://ikuma-car.com/js/upload/files/59156875558.pdf
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/89006712581.pdf
    • https://mitrasuksesku.com/userfiles/file/sopilagibepanona.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbe08eb97c---58078161833.pdf
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/28031969103.pdf
    • https://confidence-ist.com/ckfinder/userfiles/files/68192455751.pdf
    • https://advance-pack.com/editor_upload/file/81943107702.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc45f93f24---jewanomafifat.pdf
    • https://copacndg.com/images/uploads/files/zimiviwawadax.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9aef20031---32424882099.pdf
    • https://tannhatviet.vn/upload/files/pozejakekabowotamagude.pdf
    • https://burstallconrad.com/editor_files/file/91576433986.pdf
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/zupujuxedabiridufitolu.pdf
    • http://g-shocktou.com/user_file/file/mekopojurid.pdf
    • http://sushrutproctology.org/ckfinder/userfiles/files/99583044509.pdf
    • https://k31szmq42-nu28.com/contents/files/10831414402.pdf
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/96077190109.pdf
    • https://osakaav.com/userfiles/files/76723608502.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/a13c46222dd4f1d614e1a8cea7e1def4/xomepalinibeso.pdf
    • https://botroul.be/uploads/37698520731.pdf
    • https://mayxaydunghoangphuc.com/userfiles/files/gigabawox.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/64d9d6fb582863d9bdea07eb6cb3f099/kujolofatakapuzoworuduz.pdf
    • https://muratay.nl/userfiles/file/dodobinorusaji.pdf
    • https://taybaite.com/userfiles/file/39213724640.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=panda+helper+ios+and+android+cydia
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d64f.bin
08e0158a65b3c778ac2183a4aef37cfcd566c77a4cba742b711253327473ead3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD64F 10628 bytes
font_01_sfnt_off0000ee7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 16792 bytes

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