Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9594d67e2d65057…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 05:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 90059738c429ab9747e4a2097b11ff82 SHA-1: 343eb3f578e54ae2260db263a089c139ec7c178a SHA-256: b9594d67e2d65057f73a47c7e81ed220090121def73d0d0aec3a1b3bafe478ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm with 'utm_term' parameters suggests a phishing or malware distribution campaign disguised as a utility download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crewmak.ru/uplcv?utm_term=download+free+youtube+to+mp3+converter+for+android PDF link annotation
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d25521f936---41887418103.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/78937544801.pdfIn PDF document text
    • https://redfortfireworks.com/ckfinder/userfiles/files/woladalilovaf.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/3968347739.pdfIn PDF document text
    • http://kme-kme.cz/files/file/21034137278.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021091719265673499.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/50878831658.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/lurofif.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/56459896469.pdfIn PDF document text
    • http://midel.me/userfiles/file/gubugiwe.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/filuzagamefukulipiru.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/32662438240.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/wutufo.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ede8de15b---kilezufa.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/sagotilatipu.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/59c4c5024d7136409988f29417e830ba/gutujab.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133d77e447e1---21856123122.pdfIn PDF document text
    • https://airxps.com/userfiles/files/bedomunode.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/soxepeses.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/jbvt81kfhk0aogtfsnamtk7qg5/jupuz.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/8086133197.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/b2197cd71ec6e82a31044fc65bf67994/51156292021.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/xogepevakinuje.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/fanemewukutapoxa.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_off0000af75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF75 15564 bytes
SHA-256: 53ce742d2d856ac82e1058c0e51649b4f6a323f81cd9995547831bee354844fa
font_01_sfnt_off0000d68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68A 11292 bytes
SHA-256: dd327d891013be2f34d327e98c9d671a1cc0bfd299d4bd3b626d1010b608f89c
font_02_sfnt_off0000f0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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