Malicious PDF — malware analysis report

Static analysis result for SHA-256 f971826ec52373f9…

MALICIOUS

PDF

97.8 KB Created: 2021-08-01 00:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 92f1a80cf2d5a05b04b1a86c31de0f13 SHA-1: 7c3a03ce6fb4fa6ae977af396b7e6271c3fc011d SHA-256: f971826ec52373f9fa18d269d606c2dc05548d8949245084309bdfc874fc80dd
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content or exploit kits. The presence of multiple external URIs and link farm heuristics indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9716

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 http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3fc5d2b31c---92147667815.pdf In PDF document text
    • https://associazionemusicaviva.it/uploads/file/rubufipagotavifolopojije.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609218fa246c2---nukazagukojikitut.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/edqrbq1qu0jh7qv2e6mcbteb6c/dunowikotula.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/7679313819.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/32092103567.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/a6o7te3bb13t79mjnib6cdfbe2/golitivupewovifula.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a27dca83c---95921922149.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085e2d6841fc---28659685108.pdfIn PDF document text
    • http://kotolantopeni.cz/file/pubawebovaberetopisus.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/52998719437.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d946e00bfe---fopen.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9dcb7471bc---18935228112.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c53c390ee22---12998214959.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/refuvepejemaxujukuzapiguv.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874f0f54e40---lulipupatipusarugisiseza.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/vabefa.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a4454eede23---97202724183.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/c29a46e33d60a7fb4278b906ddf4cf16/40691246897.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828f5b6f8f5---15494507516.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/csemo84mmmrppaq1uidn4lcp80/lufogasatupusufebedawe.pdfIn PDF document text
    • https://capecoralliving.com/media/file/23100957895.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/f5f03456e757e8fa70c2509d3c58c7fd/47079679106.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/kejaramodefixis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+draw+a+unicorn+using+numbers+and+lettersPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f285.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF285 17652 bytes
SHA-256: a3bface1e76fe4fde8381bcc986841172295b721aafe3d779df7ab8f36bf67d3
font_01_sfnt_off00010d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D63 17220 bytes
SHA-256: 67aa2ee2809dfd723555cb4213fcfb0106bdaed3dc6dc6d229cc6d67a952ed74
font_02_sfnt_off00013992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13992 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000151a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A9 11028 bytes
SHA-256: d96b360cc468b61b05e32c20bfd709ae0cea22ed88ad8c97f5bcfabb6524a914
font_04_sfnt_off00016b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B15 3456 bytes
SHA-256: cb2d52fe43a771efe66db9c80cad701374d3b7a0e95b7cfeb712f750663cd103

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