Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b694252b85bd94…

MALICIOUS

PDF

91.1 KB Created: 2021-09-20 14:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e5f813f29129dbe43ff1425f1e683188 SHA-1: 8c801af88116e2146b5d8f0d27f0621f194490fe SHA-256: b2b694252b85bd94f0923733b20b2d58f200d04a891a5ca5bbfa3cccf39dd3e2
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 a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://clinicamanila.com/ckfinder/userfiles/files/16062911803.pdf In PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304c02d124e---zubuxewubexejojide.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314ada8161d---54160471530.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/tovewafujaxaporuxusafugiz.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/39117533249.pdfIn PDF document text
    • https://jurad.eu/files/file/wosepuxolavunupapug.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/08/file/kukone.pdfIn PDF document text
    • http://okun.su/upload/file/69480905378.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/cff4cbed5a39e1a8c4677fccde7ebd40/15521958656.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/dutaluzimonegulimif.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/vewapopirelalav.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/90178004693.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/vokepexop.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/vuwodupulobeluvitu.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/58855605914.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/97133374741.pdfIn PDF document text
    • https://menu2uplus.com/images/file/zavosipeteniwinojak.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/zikubaluxuzizofi.pdfIn PDF document text
    • http://teknis.it/userfiles/files/tewimivipisoragabozemive.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/pidedo.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/93429646783.pdfIn PDF document text
    • http://sireny.net/share/files/20392438576.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/odh7iqf20h5vo81m65h64ljdq0/43154233224.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/vizawaloxusazexuwotilim.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/39161454281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=kong+skull+island+2+full+movie+download+in+tamilPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30C 11052 bytes
SHA-256: 004719bd388d0e40e154a7134651b04f3e9e3d511ca59f25200d5aeea4d633a3
font_01_sfnt_off0000fcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB8 20744 bytes
SHA-256: 2b47703893c818c517fd23cf2e43931ce0059c50ca60fdb61e1740394c054d39
font_02_sfnt_off000130f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F6 16124 bytes
SHA-256: 06ffa8173eb588fec3a05e94d055eacf65c096f246e92b39997b834d7475e4dc
font_03_sfnt_off00014658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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