Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65776863e33b1fc…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 22:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 118438f0ddea09a3cb00840dbfab8c24 SHA-1: dcbb5d6e29d096fe5b5e7d5b77cdb62f2355168a SHA-256: b65776863e33b1fce55a8e04104b4523fe558f409045fc9ac7fac04a2b3cb62c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of these links suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/8b57bm11hdllfs00sttsgtvg0u/borivixabomukalekogo.pdf In PDF document text
    • http://tries.cz/media/images/upload/file/8370577985.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/73184941311.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/11511588271.pdfIn PDF document text
    • https://orrizon.ru/images/file/zafagijiduxaromitoj.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613354d4a0227---gimizadigodoxivizokuw.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d59bc308526fd83ca3d247d4531a2fd9/pigopeloruzasubem.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/41923335075.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363afdccc92---9065811512.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc52a03b1---wevenijipidevovojopisibe.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/sogirokowu.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/54594943904.pdfIn PDF document text
    • https://kultmotor.hu/images/files/31825459905.pdfIn PDF document text
    • https://aksusu.com/upload/files/rupuzexalake.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161386d8a87d58---105604958.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15c07129e---fakizo.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/fesezaduweg.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/gekadiriwizodibivuwog.pdfIn PDF document text
    • http://matras-devison.com/upload/file/zulobuvareropojudodefo.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/biseb.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/babigumano.pdfIn PDF document text
    • https://egca.fr/userfiles/file/dekif.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ef89702bb---96084008175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+recover+deleted+contacts+from+phone+memoryPDF 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_off0000d36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36F 19632 bytes
SHA-256: 49c5bc004af4d589e4245210aa8f3596ece6c9b36ea7c61c442dcf5bbf9a0fcb
font_01_sfnt_off000105f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F1 11052 bytes
SHA-256: 7335d38d9c2a1199cfd1cc5855289f050b56adb821cda45d02861af45cb2e49c
font_02_sfnt_off00011f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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