Malicious PDF — malware analysis report

Static analysis result for SHA-256 66dae91ddcab9184…

MALICIOUS

PDF

89.6 KB Created: 2021-08-19 17:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9750219b3dcd7a80c975679cd623bb45 SHA-1: 777cf8fcebb964c79dfc62bd6d87a8b16dde5182 SHA-256: 66dae91ddcab91843dbe88401a41082d646d400f61ec20058357ab77f87b43b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with common techniques for distributing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://medvor.ru/uplcv?utm_term=instamessage+-+instagram+chat+apk
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab59c37333---renidiwipixoperij.pdf
    • http://animalscipublisher.com/files/upfiles/file/dotuben.pdf
    • http://apexibd.com/uploads/fck_uploads/file/46626021898.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/a23c153c0e7d115b9401cc6efca3fd1e/20702466245.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/genirimiwaxedotebawagavu.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ag6l2mo3k6vpbfsvilus4qhpij/jowudefo.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160816e5182290---45244895714.pdf
    • https://ppkh.net/userfiles/file/44571256047.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16077d38d6c15a---17648968442.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739c0bec0ce---jivefodujino.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727851d36b8---jekeneziguwaloxemadonibax.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a94639fbee---mokulonijobaleketero.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7458e95bb7---lufiregevuvunibobinu.pdf
    • http://ylgems.com/file_media/file_image/file/34959943750.pdf
    • http://littlepearlbooks.in/data/eimages/file/29434328668.pdf
    • http://emekyesiltepe.net/images_upload/files/39707971205.pdf
    • http://haumeaonline.com/userfiles/file/wigojorovamefexa.pdf
    • http://macabrey-luthier.fr/data/Files/venukoboka.pdf
    • https://atlastoursntravels.com/userfiles/file/sofesowajepuzorezori.pdf
    • https://obermeyer-modemarkt.de/upload/file/pojisemiwabinotamalunurud.pdf
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/62639214788.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/59n51e31nd8gk16e200rruk70n/65843253188.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074bde011dc6---71114513056.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddd0.bin
716c208f194f789ecfc65946a1a9ee05794473aeedf3542970831571d67d46e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 10732 bytes
font_01_sfnt_off0000f647.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 16140 bytes
font_02_sfnt_off00010bbf.bin
074fe0bc08d05fae708ad5b2cea85579913d7050bfb8e0754a37a4fee628263b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 21048 bytes
font_03_sfnt_off00014024.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14024 16792 bytes