Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28ff20e2eb5ee83…

MALICIOUS

PDF

86.2 KB Created: 2021-09-12 07:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1d1b06f54f032f8929c76686fc02efaf SHA-1: 3c766e72f126b6ec7fb3a34b09ea2fb9957b20bf SHA-256: c28ff20e2eb5ee839bc57cc7b549aba91f8c02427fa9af3e8f07f29a75a1e873
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The ML classifier provided a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=he%27s+a+pirate+piano+musescore PDF link annotation
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gogimefofikowupipidopu.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/33275634673.pdfIn PDF document text
    • http://speckrepej.com/upload/file/xukixowugotekoxitunesu.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9040c2e49---50575584342.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/58436374899.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/surifezovejazu.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/veribuzawowama.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/dagagufemelabezifefedaxe.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/tubejepiwo.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/46230265940.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/tubikelatele.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/15250501983.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/voxegasefazozojuven.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/24280472800.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/tazokowovifodujep.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/29fe5cf79832ff24ceb138fd9e8ee586/25287558038.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18708098389.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/rapamujoja.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/tuxapawukawazoge.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/5422290957.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109011433445545.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/levibupakuvumomogojipida.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/jazumusajitisuwemet.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139060b11306---bonuxoxo.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_off0000e78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78D 10616 bytes
SHA-256: 2095b17e305be315e5443ad66e2133522cf5b2a097409a02d4d6be5766b85a0c
font_01_sfnt_off0000ffde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F0 19100 bytes
SHA-256: 3b31961c810100c0181df364011eb454b375cc310498629eeefe6244aee20e50

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