Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6efc50d9ff5a6e4…

MALICIOUS

PDF

73.8 KB Created: 2021-09-07 12:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 525f2d40e5ca6721109296febf3eda55 SHA-1: d88a296081971f3743c3cc9d919d9cb743d6b6e1 SHA-256: c6efc50d9ff5a6e4e6dca38b64c1b08ceb68ce97e70ee1cbfd94ae4f14979779
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/66ca71bbedb4d5d32e59e3a87e008edb/monuxururem.pdf In PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ff4c91e57---begafa.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/fugarugofuwafa.pdfIn PDF document text
    • https://profession-your-dr.com/uploads//files/202108130605049842.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/16153162723.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/badomabidusabubu.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/c96f566a63fb741c17eedc6578d157e0/57665228717.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/43961400395.pdfIn PDF document text
    • http://rubensova16.cz/files/file/bazozexumalote.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/fixepidekeseruw.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a65d507e5---8527933555.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/nomedirip.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddfc5ee54b---kepofurafibogijukowe.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/dekiguxopogiwofozekebe.pdfIn PDF document text
    • https://digicpictures.com/downloads/59142066507.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d249a930b---81017314360.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/93460662610.pdfIn PDF document text
    • http://biosite.ru/images/news/file/26917775671.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/hfpun9l6t9nfm6eb8pskp5o3l0/1532549427.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/61248bac0d531.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/6a3e5800939e08e9cdb098dd23c05fa8/11093668835.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/kewavavejiburuzemimumum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=schindler+3300+elevator+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD8 10984 bytes
SHA-256: 3289a6b672d14cb3cb4762720b77faeed528f96747d601283f3418ab5c29783c
font_01_sfnt_off0000d459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 17572 bytes
SHA-256: 820c73c66ff57e27e3de8ca065335ec6362c397ce6e00bddad023e1e2c910e73

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