Malicious PDF — malware analysis report

Static analysis result for SHA-256 497a360b25924652…

MALICIOUS

PDF

82.9 KB Created: 2021-04-28 21:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 11cf1f00955170c42d192d9238114a29 SHA-1: 1cc20e6ccc4bc7e2f7f7ce764db8d30944680f64 SHA-256: 497a360b259246526b54ed82fde9b06319ca58dc231ef97ae0fc48e0fa0497c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/a1f6c07802440b2c08fe3b48349d554e/xunawiwetitutaboxoma.pdf In PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160790db33db20---jimofavumadotomod.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/gof24b5giq9eaom6imhjkl9pc5/nepuxi.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/q9lhhmsmas68mp7bktn72ao484/tevarigomomeseparifot.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606cda9a01dc6---pulugonebiniranixuvo.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c63cf9683cc1c5d8c7371d139de0e070/12299702833.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/3u2tr9junlqf8ms5apepdgtott/xiworafugigonevosoxajelu.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/c03017688f899e83dae082cf0de87cad/41232751718.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/s0o82kfvd0tg88ih6aci1k4292/redotetujakusepuxexu.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/h0ts2fv678onbe48r0q71auukq/laxulaso.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071ffe3eb3ab---mekusafamamenefefodigaved.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/009889bea89c118276599d9f2c775083/95476395904.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160844943b8f2c---28095378906.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756a1f125c3---28684667403.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1da19920---18970138170.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074c9de2f56d---71099681680.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=blade+runner+2049+soundtrack+digitalPDF 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://scripts.sil.org/OFLIn 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_off0000cb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5E 10636 bytes
SHA-256: f91c04cf626be197a18d9d5e0f9479ec7dd54d2e63ee3ec1e5008f92d497e5d9
font_01_sfnt_off0000ee38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 5740 bytes
SHA-256: d7eb3a91d09fc761a66122c86659d89595bb89446c1b14c57b1d9ea1c97620c6
font_02_sfnt_off000101d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D8 10508 bytes
SHA-256: 5e5f0c941973883ab673c043560be5a574039a3ced8e0564222e550212325de5
font_03_sfnt_off000125b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B8 16320 bytes
SHA-256: 8f6d0cb27969d3641d2d207bb2345d1ba16b9e4954005b3012a341577274fb30

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