Malicious PDF — malware analysis report

Static analysis result for SHA-256 8092b6db50fe3d44…

MALICIOUS

PDF

87.4 KB Created: 2021-09-03 22:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 881b4a091dfd23ca49785cd628d0a3d2 SHA-1: 12f80ebdeebcbc2105c53cb06f98b5f31446af5e SHA-256: 8092b6db50fe3d448f61b1c2657a9dadacd533a479f33f4ad92a7a6f02d97e59
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The embedded JavaScript likely facilitates the redirection to these external URLs, which are designed to host further malicious content or phishing pages. The presence of numerous external links and the nature of the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.pratikchoudhury.com/fckimages/file/19085766587.pdf In PDF document text
    • http://mlead.net/images/e/file/vutajowisafegujuxab.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/sumorelukosipil.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/lvvb68sqi09vb78f7us3r2qa75/rajatavofasekowukirekoja.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/medabefuxifotusaka.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/gofido.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/xotinifaziragibeb.pdfIn PDF document text
    • http://tipiland.net/upload/file/18035602494.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a175f4adffa---48836357772.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/28196756660.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87ec801362---69169765601.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/bogeworusujedekekokalup.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/20017534541.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/75149586723.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/nrm1num3jigmncedcnrqae62m1/10080038463.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/tokutiwe.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b82e1d46d15---pakepozebonekojageba.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0d3d852ea1f84208072e41fd132bec79/91603311917.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f29828af8c---13130657977.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-18/20210518122545438420.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/fulitavorunusoxonagapi.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/3a6433b94b86f3ae654bee6e197b3914/suxorizebizoxi.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/14886330299.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/6249e1ee0c694829722dfb8a5971db36/12336969479.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5640e361c42dd5b895596553cec78f91/99575532839.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202108182356096386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=millimeter+wave+radar+pdfPDF 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_off0000e8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 10412 bytes
SHA-256: 42d1a4387d3bfc22fb46fb8521b3a48eec8f830e97c0fe8f5754993863850e8f
font_01_sfnt_off00010090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 21644 bytes
SHA-256: 62690513393bb4077321c3e21dbfedcbe11f0f555dd468a411c61c0b9809d236
font_02_sfnt_off000137eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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