Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c3a68db3236889…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 23:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 866dd9b0faae63f7fe899d14309ba8bb SHA-1: 29f46b8ea84f2ac2d2d14c66504a4cd6d7c9e42d SHA-256: c8c3a68db3236889cd2256c3fa5e0693d89be60bcea83a5e7406d0af5cd468b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of external URIs and link farms strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://crewmak.ru/uplcv?utm_term=translate+website+android PDF link annotation
    • http://darstin.com/userfiles/files/83098230917.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/3606684834.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/gepup.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/karapojisugokulebodemoza.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/pomagapopelobebobuva.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/81l9qc36g26q0hna1mmkrmsad2/jigukakuzebujuwi.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-5/20210905194714745564.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/87793293784.pdfIn PDF document text
    • http://sro52.ru/uploads/files/59300524697.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/likalawunoxejejurowaja.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/45193193371.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/girujefafuge.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/kasosavogudolugad.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/71566024474.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/folosewugowumun.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/91653550639.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210917_AEDCBC7FA93DF482.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/22400493222.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/4077692170.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/jisiduvuxadare.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/pulefeximimowadavasedupet.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141188e3d886---26304827468.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/dosudezol.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/11284590321.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/nemojarixisod.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ea7b79b2b2088cf4c0cf4a9fb40bcf8d/lutilalekorafixo.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202196945279136.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/wofilegomelokumevebede.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_off0000d687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD687 18820 bytes
SHA-256: 8a60e18f3c2131f3fb24b05077141f2534d7ba98f04403d7ec44b939c89fd719
font_01_sfnt_off00010750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10750 10428 bytes
SHA-256: 2ac8233943f2c2c07bcd038eafab4275e46e18b24cc8bf211a38eb4db59c9e74
font_02_sfnt_off00011f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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