Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e0d309b66df6fd…

MALICIOUS

PDF

86.5 KB Created: 2021-08-13 12:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6708d018ea98b992b33e33c794e8d41c SHA-1: a94faaebe4760d627061387d395de49a06a5f8aa SHA-256: 72e0d309b66df6fde4ff80917d008bf1e155d7909c8efc9189f533b3d2a16f06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm intended to obscure the final destination. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://shannonlakeestates.org/fck_images/file/23290241116.pdf In PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888de261c24---9717661064.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa11fdf996---49147191852.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2915f6af55---12379962724.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/zufularuwaxuxijanojepa.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/78420028261.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/9789156637.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/52128376933.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/41104836306.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/497qchp4e52a9l7pfb29r2l21r/texasonaju.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074889e11106---bogudojeluxovizodod.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/0564b8bb8698308f3fa9f773a9d059f2/jamizemoxu.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/nukapezi.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/sudinizolipabepuko.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/7290734369.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/9e876381777ced0e5cf972c37003f73b/73352316794.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2b12dcd4cac74c125d9baf226e568ab5/87828429266.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e92b2ea9f3749baf6cde5d22c11e4c77/82777455963.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdd54860c1---32059132370.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/388876dc2187a8548ab05449457e5a51/lanoritazevububigonanefo.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/kosevisubemedalun.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606d153364866---67909470534.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/110ecaabf382f750fd5b12fba51db85f/vusidodeboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=volume+of+cylinders+cones+and+spheres+maze+answer+keyPDF 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_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 11208 bytes
SHA-256: 169ac7e54fc9817793ae1622a31b8a51ad398510292e5548b27bba0b9aa65988
font_01_sfnt_off000106ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AD 17140 bytes
SHA-256: bf42bf360d848e31da08e89f3d2af605ae5dfa98f2a704d00417417339935a7a
font_02_sfnt_off0001337e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1