Malicious PDF — malware analysis report

Static analysis result for SHA-256 663fcc897d2cd28e…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 14:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1c43681c7efe0d1cb2e595bfa0d23898 SHA-1: c0dae1750007ba3a5fa4008ec85d85900d7e80cd SHA-256: 663fcc897d2cd28e8b7e6601124de6d7ff893ced97bf54382d53d7548b8e6f07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://wastran.ru/uplcv?utm_term=stewart+multivariable+calculus+8th+edition+pdf PDF link annotation
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dca75416e0---mumem.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/vovixapux.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/nezimoku.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/19930193994.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/lulope.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/29973029151.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/5358039472.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/80750494917.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/72169049490.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/zuzitukigoso.pdfIn PDF document text
    • http://novafish.it/userfiles/files/dewubirukubo.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/59076985133.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/megidun.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/netajamotakowiz.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/megaduso.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8c7d6ab80---82757175998.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/38249868868.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/jiwelofuru.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/maxapabunejewarovopedibid.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/55460038624.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/negeminekazive.pdfIn PDF document text
    • https://red-adlay.com/upload/files/jorulowanumuxedijov.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/32932015918.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/1923cc9e516adba3ad29aa1020d1ed2f/38390656288.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56706141792.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/rukimabofugovepa.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_off0000b23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4C 15412 bytes
SHA-256: 4b7c8d135dbd31a83abdeb985486f91a94692d74eed7b7aa0b0c75821a54c28b
font_02_sfnt_off0000f129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 11560 bytes
SHA-256: ff16ed09331a3c0ff43200d69daec2aab2f1dd0dfa49372cb8e137b15b15ef02

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