Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e0ff9341e37b33…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 17:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0a7cc2d08f5f9f6209dc5a90b8f7363b SHA-1: 2ca76f9e9155f4e884b01645807df44ef7e21643 SHA-256: c6e0ff9341e37b334b48178bb507825040a117005faee79a5c50c52369336b00
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://laborke.ru/uplcv?utm_term=is+there+a+comma+between+the+state+and+zip+code PDF link annotation
    • http://vanprodukt.cz/UserFiles/File/51723655035.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/malimapumekipofexulusumer.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/74006022289.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/51127784530.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/zepesusotafa.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e55ef8409c1641bdb981faad69899e01/92519990480.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40152f3773---52069700192.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/14849644495.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/nubatinusuladomife.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/d3d8946264ff12eb8f28ba48495265ed/5089547832.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/a7sjcmlbkftgv6382kbbmko2oq/56125091166.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/97297251179.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/qg5bovv4u4i8g9aohhq6adei0i/50010570470.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1555edd32---nojed.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/71242448730.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/42424238377.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/jenigopusidegukuvewe.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/batofapolobusin.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888de7044ae---gagofoka.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5f935b4be---51917506107.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/318025720.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/37121333404.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/wovusudux.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/55730457683.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/xikazosixodiluf.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60b540e4c---70780982238.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_off0000cee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE4 18432 bytes
SHA-256: 0e3573e1a914d2962115c4df4bf17c5ea9f507c7029b9b927bbdebd35707a252
font_01_sfnt_off0000feed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11704 10968 bytes
SHA-256: ecb58d19cfc4e79f522b06bfa6742a4ac1e52e2a37698101ae945722cecfac4a

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