Malicious PDF — malware analysis report

Static analysis result for SHA-256 159e233aaeccaac4…

MALICIOUS

PDF

73.3 KB Created: 2021-09-02 07:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f1166a2b276f4e240c86496e9b6c6f10 SHA-1: 750ccd668f3bab92f42bd91ca76368806de60782 SHA-256: 159e233aaeccaac4767ecd5e3c0ecda5ee9f0e845a5d31946d3ac84c2876b1b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple compromised websites hosted on disposable domains. These factors, combined with ClamAV detection and ML classification, strongly indicate a malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://drafthe.ru/uplcv?utm_term=frequency+and+speed PDF link annotation
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16126b03bb0c74---topuwolivepijifupofuk.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/21d08e739dc67661cf8aefe526af9dbc/71531378199.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210816091854509.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a5a3424ec---55547552826.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/lureza.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/23402724304.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/zevopekirotub.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/mavegurepivosabewonerinib.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/siguguri.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/64302804422.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/lujafazaropesofibe.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/dapuzupukemufubusalipu.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/0db3357ee0ce22e78d4c5a6fcb1dc063/75133582753.pdfIn PDF document text
    • https://cochleartudaskozpont.hufiles/tatejojot.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/fef4uasoer3ou0de55oett8s0v/90241887326.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0e341629---tajeluzusotuxisafadaw.pdfIn PDF document text
    • https://yellowstonewildlife.com/5132860801.pdfIn PDF document text
    • http://medi-sen.com/files/files/2083178955.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/momidukijekexadura.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19826e00a6---pufevadekabobifemida.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/25886805389.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/2tkggneumhq6evsheaao76615e/24419552636.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/zuwusufek.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_off0000bfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C0 10488 bytes
SHA-256: b0c79cb8c3c31522a2c542fa842e4241d36513fbb956fc17dd56fcfd672714b0
font_02_sfnt_off0000ef75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 15584 bytes
SHA-256: 6ffdc3070b3b3570c3e4c5056368fe2debe38f27cceb25158112741845a750b3

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