Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc77db5b5ea9a29…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 12:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2dc59fda99f359f1c7b779d197b4b3d7 SHA-1: b7883d65b41d48cf9ac6cf3a3158611bd81c1d18 SHA-256: 9cc77db5b5ea9a29eb8fae2e4b9096ee01982860be90674fb4fb555784cd41df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites, often involving embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/869562180.pdf In PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/nbeif38lg4308ave699nbtbuhs/9873392829.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/lujinajabebudelog.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ugj7nu9fbl3ghnn8j2nirguue3/71248862089.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/80c7f14f6069989cc91295f42643eb85/ralajesipizefajalozofi.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/xuropukowejexedonijemazi.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fe14f2a1f93---82772733935.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec54d67d5a---27680048199.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/55010768861.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/ladotekasutikogobat.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/o2pp4j81nubptopn6tu3p8nrnv/22777133402.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/zulido.pdfIn PDF document text
    • http://tipiland.net/upload/file/16118056666.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/vubuwufomisinuzufatof.pdfIn PDF document text
    • http://www.heksan.com.pl/file/75421326057.pdfIn PDF document text
    • http://z500.si/files/42713371456.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c3f9846e6---tesexuzomafetetib.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210818114318.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/57962095360effb4ae3930.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/1026195532.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/68733401077.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119d17049936---99039391506.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/evci69mpe9rjunorkbqrg8c94j/57624434849.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/25471245798.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ddfe5617c9233b917dd97bf72861a036/94797811348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=science+class+7+chapter+6+pdfPDF 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_off0000d3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 17044 bytes
SHA-256: 401e3b49fa60e885255978e2d75ace515e8d00df9607003f85534aff43090ec2
font_02_sfnt_off00011819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11819 10892 bytes
SHA-256: a55192c22335f4a43f58959fbbeb587c83ddaae81dfa1d50426b8e094c07748f