Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fce2622077e07c4…

MALICIOUS

PDF

77.7 KB Created: 2021-09-06 21:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 91cba29dc40d984fde2165187cad42ac SHA-1: 87b4360ab262eeabcc0c68a0464a7986ec4c7ec1 SHA-256: 3fce2622077e07c4a888313a5bc0959407a3f696c7df6495bb02137fac5b3dda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://smidgel.ru/uplcv?utm_term=questionnaire+example+pdf PDF link annotation
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/am0u5cbbr0benr3pmm5uge1mfq/77981717997.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/zopexebovalijogikakep.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db8df70c93e---fotozep.pdfIn PDF document text
    • http://polkovnik.su/upload/file/sozusezelexonogavugo.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/76922888001.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/tamawagugovofudid.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/jurirowedovomipidanapa.pdfIn PDF document text
    • http://climtech.com/files/files/relosare.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/44822149353.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/tekax.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/bezabelagobaferipixixoxa.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2de304017---84474313332.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/repejaxulalazu.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/79132877549.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608505cad4ee0---72091108975.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/28604147020.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/tojiguloba.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/tumujidijabokipitopub.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/17586110285.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/nenotefuduwuf.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/fhibj9np67jfd0019i9fdim9j5/72894940767.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee539e90a2---34863182952.pdfIn PDF document text
    • https://lasanisports.com/files/96338219217.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7ee8be60b2---fejadudaloxag.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075de0c89af2---moverasapezugusapap.pdfIn PDF document text
    • https://pmms-online.com/assets/file/37626397934.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_off0000cd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9B 16604 bytes
SHA-256: 335454d457a9b2e7ad19252a096c797f18b626844356d7969adfdc9943b91320
font_01_sfnt_off0000f7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001100d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100D 10920 bytes
SHA-256: c6a06c71f59bfa5662758e0fc03d5b414eff70ee5a355e271ce792ffec24a577

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