Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb90e56a90f71aec…

MALICIOUS

PDF

235.5 KB Created: 2021-08-14 16:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: caef29f56a0826653fcb26be39f0c028 SHA-1: 460eeb3eb4c2983ad2904e78d466d4c745125d50 SHA-256: cb90e56a90f71aecf650d2d11d30404ab839b2ed68dfc8eec323875443bc2a26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting an effort to redirect users to malicious content. The embedded links and the nature of the heuristics strongly suggest an attack pattern focused on luring users to external, potentially compromised, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9831

Heuristics 5

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=answers+to+cambridge+igcse+chemistry+workbook PDF link annotation
    • http://automozg.by/upload/editor/files/89511767427.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/xujidofoxaxirixa.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161117f5051bdc---33741286814.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/cb904a9402f42c2604f94020250f6056/vurinawebodibojidomesusi.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ce800eaa9102d4c59df81f10629ff7f8/16348495131.pdfIn PDF document text
    • http://1975geegees.com/clients/78603/File/33681494358.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608480074fb52---26363226171.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/gepesepuzizix.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/c7c751a9a7db3f728d2e6d42040b33a4/girogizero.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/wuwujokevisaworapesi.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/25076640226.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/budenibotanawufefinofaf.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e94813a733---6277013886.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f397757a8---zixarixuza.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/xelusarunaxu.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/34776757137.pdfIn PDF document text
    • https://menu2uplus.com/images/file/zugelejoxabuf.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/gvgu8fnclfsbkg69gva0lmeirt/dupezo.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926eb608b78---27085225661.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dd63a668d4f---ragebowula.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/olshsd49arr4baui8kuhogupsh/48481369447.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee69ca451d6---67924962974.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/cf9201e5e54191f76dddcf09a80c92b8/wevozerifovexojak.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e84129519f---57362524744.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_off00033a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33A87 11184 bytes
SHA-256: ba8e8f0c6002a18dda73f09747fc667186777bd4effa1985d237c6461cbeb3fa
font_01_sfnt_off00035470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00036c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36C82 19012 bytes
SHA-256: 61a194a64c1f252529ecd79a79bb4460fdfc2f133bfb0693a0c9c37b03150047

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