Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b5d61bb8f968a4…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 05:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8b463bf69c11a617d3372831aef7ce06 SHA-1: ddcfc276af184fdc8f1135a0940ef18d3d583f94 SHA-256: 25b5d61bb8f968a41b9f718e4b8a96648a31d10a1c438da09fe15af53d86ff27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://chcial.ru/uplcv?utm_term=think+and+grow+rich+workbook+pdf+free PDF link annotation
    • https://upbilbao.com/ckfinder/userfiles/files/8395093135.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/bomuso.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/fotoxelevi.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210714_6D07AA1E6ECB41F6.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e4eb3d780---33846278179.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/77424333480.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081c416f26ab---difasarabog.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/92406064416.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160778917353b8---kebapexuzasuledumil.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160acb9906e5c8---mibufajomuzaxunoku.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160c560852780d---supojesevoladitilokape.pdfIn PDF document text
    • http://simoncaulkin.com/images/51991920471.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c7caaa7970b6a815bd14f71cbdbd9ab7/nelomesitaxofobisunekup.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/c571daeca648d62a0fe09cb3c64dc9fa/jusirezavuji.pdfIn PDF document text
    • http://cy2hand.com/userfiles/lizol.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613196342dbf0---6738196723.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160868e8a6caf5---84162533857.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/73383704331.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/25666110190.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/roluf.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/dc2f2bbba6008cd39645e571281c8191/52665875691.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/476540965.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/5200770c0ec401777d1d4f206221f855/xolaxosetidako.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/xijujunifokemenileti.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160baec056b58c---gukibobikefi.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b323930122d---19904648860.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_off0000e1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 10868 bytes
SHA-256: b0233bdc40c4664a6e04c2f39fe36c94e7d0d27a51946dd0095bf191b6c75ddb
font_02_sfnt_off00011288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11288 18920 bytes
SHA-256: b814c7fd406bd2315b06a3904fa9ee42bb52190e07d41c1bbb08c23bed7c1e72

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