Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e0184ebdf491dc4…

MALICIOUS

PDF

88.4 KB Created: 2021-09-19 06:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c323ee70098924d989647652f776639 SHA-1: 238b4ba9aad1a538f554b5dc3a29f10803ca642f SHA-256: 2e0184ebdf491dc4380375c7778121aa8c23e86e5ddbeb253754bf4a00323295
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c5c639aa5---dosolu.pdf In PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/lepusewazazetafobukur.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/61104653437.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141e0383a284---muzakoguta.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/66650907442.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145662a0a770---xavajixofezumeziduf.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/sewiselolatef.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/pabonabowodepe.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613045167ac4c---27454295560.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/feluwazusaserunomibob.pdfIn PDF document text
    • https://halead.com/uploadfile/1630924365.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/32267105150.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/41398370048.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/98002398538.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/pazoxiluvol.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/4080924514.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/86903427518.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/91184306299.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/48771921388.pdfIn PDF document text
    • http://jecoexports.com/ckfinder/userfiles/files/20883804762.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/90788345026.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/51699583623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=top+gun+1986+online+freePDF 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_off0000f55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 17840 bytes
SHA-256: 4e75fa17082ed6bffc1c3b1298be377a0b51ee65c6b52b49a0fb71d84558054c
font_01_sfnt_off0001234b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234B 10764 bytes
SHA-256: cff077eb50b588fada7a72c7a898c56d2813d92b094b522f03aa557be59f1165
font_02_sfnt_off00013c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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