Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d57cc22aa8508d…

MALICIOUS

PDF

91.4 KB Created: 2021-09-01 05:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1fa72f77fe6272bcd4e3d2a83048c666 SHA-1: 530ecebaacd0e7605bf3aaa5ee1bfd3668714051 SHA-256: a3d57cc22aa8508d84c0dd7390dc17f35b6d7399ca0bca020ac6003f7db02e37
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a link farm designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adef5ea58b9---zukakabipuvib.pdf In PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/pukitemibupanisipumudixa.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8ee49b358---33150282092.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/mopizotek.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c093f909b7753a7bc9cbd9921b99b9b8/busudujepinivokawagekaket.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/resinaxulegemo.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/4283d478f768c54d0104d8542be6cd10/2277020734.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/75436998726.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/dufazuzijufeto.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/6b6b303a84e71a2bf648b276f7c5502e/33150806490.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/778d0d82d6b3c43dab1132653ce15f79/98228268119.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/91063881850.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/kotawozovola.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/u468os6sleqvfvhpjq6gtagvph/70797805905.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/sobivikijululemus.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/a488e51b5318872799da3d495300bedd/wutudexefikat.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/2b4142d23722d4c79a13e51624a0b72f/sobuverevizimivivup.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/nisexiwapezupuwozenapap.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/27298182191.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/d9115e3b5e3d827dab83756b434e9c64/68338331097.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/nafajezezoretufo.pdfIn PDF document text
    • https://migger.dk/userimages/file/20247628685.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/femafafidipivileliv.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/29832468559.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/91981796101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=warframe+how+to+get+void+tracesPDF 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_off0000fc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 10920 bytes
SHA-256: 97bdc2892a93dd99e73065de1de8b0c00a99ebcf0d385294cccd7f76e96407b0
font_01_sfnt_off00011557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11557 19244 bytes
SHA-256: dc2732da2630334f540b1b0a84c9a1b33d15e40f04062abcd59d99e7ef881b50
font_02_sfnt_off000147cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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