Malicious PDF — malware analysis report

Static analysis result for SHA-256 321330fd26d438af…

MALICIOUS

PDF

82.7 KB Created: 2021-08-30 07:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 348b64fea8d2f6300572641dfcbf1050 SHA-1: 73c9b2efcf96aa7b8a098b3854eac7b43c204f8d SHA-256: 321330fd26d438afa76fbe23a3a74f7d28cccb2475c0ea7608bbb78abc0589b1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML score indicate a high likelihood of malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://veterinarioassociatopacinidallatorre.eu/userfiles/files/fazidokezaze.pdf In PDF document text
    • http://haiqi-machine.com/d/files/rotujegamoruwalavadole.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b08754874f---lebugadobo.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d0803608571---59128629110.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dc26b2fab---bolasavolesula.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/gebunegumisosuzabemepo.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/jnkm9j4otc5mktefqfrph744jr/8075309208.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4220c7ce61---6671310614.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/27588865567.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab11129b365---95982052005.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/39358008046.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/89177607344.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/33173232408.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/7f063c054891903e3ef287c3f2ee8dd3/wevebagizosi.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae93b04e762---76316966968.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/paxipoture.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160724425473f4---16938154911.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/052218154704.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/78046b8be71660f930319f620df1e34c/tovobokosojagebeji.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fc890260377---11440743989.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/nuzox.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f06ac1f0d69---77718839439.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/26316f462a9c8270d07bc6246f687087/xepamimapogedirupovav.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c142431cfb---77687310700.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/91780606641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+ethics+of+school+administration+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_off0000dc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC59 18360 bytes
SHA-256: f2949f57f2e9279a2c0646af7eb91aebc5362080f4385bb7147cfa22813c8fc1
font_01_sfnt_off00010b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6A 10848 bytes
SHA-256: b4dfb628db9a3abe3535fcf302ee809e738d2f36615be1b9148a37f0ea58851d
font_02_sfnt_off00012444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12444 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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