Malicious PDF — malware analysis report

Static analysis result for SHA-256 9831e5317fe64198…

MALICIOUS

PDF

84.4 KB Created: 2021-07-19 18:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 373d14f8abc1f2b3d8bd5c3c98b6ea8a SHA-1: 77ce535dd230ca5a10fb8ca56e618d9d43e50516 SHA-256: 9831e5317fe64198fc79556770e3526ac9c93b53978395cef80481e23eb55de7
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a deliberate attempt to obscure the final destination through multiple redirects and compromised hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a82a46c2c---5292058203.pdf In PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/045db6fc54f0d654bf1256abf7d3b971/60813038784.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/nonadafezitopubilirox.pdfIn PDF document text
    • http://falerisztika.hu/tmp/6384831289.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/biborolosukadobuximan.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/tg8kqubn0cjstfg9ecdacm9l79/94478121967.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/34352f9b20859e1a0651e8bae1a38b1e/gumirifosaxiku.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/17386972473.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/63067398836.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d21a9d50b0d---xipapaju.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d574a91b030---48265311228.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/dp5t4r9voug23ol6a1u3aapmcc/bukikukimukomapisita.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/62985555517.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bda44c7034---pajilesokilave.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608443b2b869a---gomagebofulamokugutulu.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/97102647486.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecf0b4cfc6---jodetedokigovadifop.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094265a1f797---gogadepor.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/rojido.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/39945383803.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/36865448869.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdacab81b3---dudibupujawodevadi.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/pirufijevefegejawikadoti.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/e48lsolv7m71rnk2dnsdn29a53/visusujasuz.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e36fd8c2994---47800528420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=baby+dance+video+songs+free+downloadPDF 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_off0000e758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE758 11012 bytes
SHA-256: 238b6ed36df7ae6df3f90603c65dcacece1e181a1ca061ec4d11304fc42f22a5
font_01_sfnt_off000100f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 16636 bytes
SHA-256: 4a297baabd7c750489ca1876be78d0f307aecaac2ef937aac92e08c04219cc4e
font_02_sfnt_off00012c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1