Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f62d53d222313d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 18:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7f11b947b564855597809336dbae67a8 SHA-1: 87a2f9a578b86c408116ab81320835ab92b172b8 SHA-256: a9f62d53d222313dbaeb6fd82a58505885509fe507829fab57dac3c5a4023399
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external resources, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://prana.video/wp-content/plugins/super-forms/uploads/php/files/r7p7m8636u1fh61snupprj2gu4/53968510540.pdf In PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d901e13368---90908211434.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/vababipurex.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/bugaxozotosasakerapigu.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/vebotatelozudujoleto.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/74425924054.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8feb149b1---10175829863.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/6fc46525fba547e08bd3fa314003dcc9/divanetikozosi.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/xufemedekapetetumapi.pdfIn PDF document text
    • https://dm288.rs/slicice/file/9883387547.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/15112635350.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4d5e91b3e---dasawejegimameraverux.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607b68782e79a---22553390460.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ec172302---rogapurevukuloxim.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878746eeed4---rufamis.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/2134918667.pdfIn PDF document text
    • http://slsnn.ru/content/files/fapir.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/63810922dde468b281681acd2ec06f99/sopisipupawelunim.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/sufizuzusufawajipikune.pdfIn PDF document text
    • https://eclearusa.com/images/file/98247734134.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/fec24335180a60a5a89accbde520de34/tetidobaso.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9bac08c59e---53572455706.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/18784624477.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/u38ap9ju5q9nnbvnru39l0qq95/57545590573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=handbook+of+educational+theories+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_off0000d2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CF 11040 bytes
SHA-256: c9ce2e1b350bd6a456c9a90077c25a7686da2bad4171b39170e6923b1bec73ef
font_01_sfnt_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 17712 bytes
SHA-256: 535b59e51eab57decc0dba44ff314084b67dadc331d569b44f6565c04b4c3c3a
font_02_sfnt_off00011a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1