Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66480345c44a90d…

MALICIOUS

PDF

71.1 KB Created: 2021-09-25 00:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ccdf8d56f286859495ed361964ac2eff SHA-1: 664406f85d7125b2601d79a0a091503fd6f63bbe SHA-256: e66480345c44a90d27502d17885410ef4a3b3593ca9f1e043c8c78dd20ad22e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The presence of external URIs and link farms indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • 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://yuemeism.com/uploadfiles/files/wobijojuladufok.pdf In PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e6e3fda4393ed51cf09262181d4f5215/51730377458.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16149847447683---wipadot.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/36682157917.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/rebewexokomus.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/dakojedefapuwija.pdfIn PDF document text
    • https://digireg.pl/upload/95130526291.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/papugenobifota.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/49683211039.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161353ba1ce748---vopevinaxufonis.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/5936623003.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c04706cb1c---42622740971.pdfIn PDF document text
    • https://latework.cz/soubory/56610888684.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/45015100935.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/rakopinoserix.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/76241722021.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/dojuzuzitegunadesivo.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/1784915365.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210916133435.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/buwunatixunidal.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/1r2ud7r4rlmvv5bjl5r01g00f3/novezeziwidijimowigu.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383c334d07f---xezudozawosabutunapunolaz.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/najirotogazigabizizigonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=euro+truck+simulator+2+mod+apkPDF 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_off0000b36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36C 16888 bytes
SHA-256: 794b6adfb74a6c6b43e0a97bc4eaaed566b03beadaaa7e4653b91aae3f13212c
font_01_sfnt_off0000ddd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD7 10732 bytes
SHA-256: f3e88cb50db79294c7337c6914323110dfd9134f85c55f8968c529ed50a4aa50
font_02_sfnt_off0000f697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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