Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f0aeedefdc8e23…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 14:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f6ce5ba4c023a4396cbd7601f25e97ad SHA-1: 8ea888ada4f865c275453bebd008c0b1b9014257 SHA-256: 05f0aeedefdc8e235e50a3753a40a435f52167ed52520fa2101d64f4ba535430
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The presence of external URIs and the nature of the heuristics point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=app+for+transferring+data+from+android+to+iphone PDF link annotation
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/0fglvsd7pgdororr2dmjslpd3s/11515741603.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/25094166347.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109030705256312.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/juxina.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/90457779743.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb1b37c34f---faloxegotimepa.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/87246130934.pdfIn PDF document text
    • http://selidbe-beograd.info/files/49945886499.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/wutotikusumaxuderiduxodol.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/11999856288.pdfIn PDF document text
    • http://furniture83.com/upload/files/98693198519.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/fogopolajajafivezajise.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/52094116526.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/63774774125.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210907165911.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/38188220138.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/13917114041.pdfIn PDF document text
    • https://mfdesign.hu/files/file/bematojidazojuwekusiluki.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/4kmbnfolfd2ukqvbfrdb4iggcq/83540358487.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/54579413510.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6ab33bab6dc3400f022391201f0d25d7/funuxirigiravenalakajuzow.pdfIn PDF document text
    • http://drtamerturan.com/file/kitebosod.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/sifezalelipeputigelatemuw.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/73746212219.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/duminorodesakud.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_off0000d0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F5 10880 bytes
SHA-256: a29139484b16d2a6103e2c83fafb6fb61509ee3a8d8412b4fbae020e8c65d016
font_01_sfnt_off0000e9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 17284 bytes
SHA-256: c696831cf337ca114402ba824eb32d6a01bf7199536c29dc7c30a2ea531b4f66
font_02_sfnt_off00011660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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