Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ad55deb9ba7638…

MALICIOUS

PDF

93.8 KB Created: 2021-09-06 01:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7f894eb3d73ffc86fecd900b5b06e577 SHA-1: 44bb8440d039c6929373d599c4bac47da98d0de2 SHA-256: b7ad55deb9ba7638cc28c77adb824c6aa18735c9780a0d8635faa9e117cca68b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to potentially malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pnp-studio.com/fckeditorfiles/file/3474853084.pdf In PDF document text
    • http://drapa-technika.cz/UserFiles/File/lipusaxisejatexo.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/99961691155.pdfIn PDF document text
    • http://sam-global.info/files/file/45529527437.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/gekisubu.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/lobin.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7da11509e---rozev.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/86928210643.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/zawoxonaxalavez.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/0177f43a49c8ea58aac96aa691e71530/64931285078.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/14835212106.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/18304074004.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/rubofabukivotiz.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/15d3af2f8af124ea776f0543b7cd12b5/sikepinuli.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/16097421899.pdfIn PDF document text
    • http://lawngo.net/fckfiles/rorid.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/gusot.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/66789812207.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/71785987919.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/30f5a4a1e83d75d935d5f56a9aa0d623/guzolawikiwijon.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2ea3ef535---27115106684.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161287ff576901---fanumalekaw.pdfIn PDF document text
    • http://ozari-ua.com/files/file/91361624461.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/27570982154.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/59184250334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=5.3+graphing+cubic+functions+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_off00010671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 18516 bytes
SHA-256: 04553d193995d5d02a9549fa28d1d78cda74fe023f45bf204ba73e9afc27ca2e
font_01_sfnt_off00013759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13759 11236 bytes
SHA-256: 4d17c4019297d15831178be253dce3f9260f0008cf3ab7f71e6fcd0ffce2dcf5
font_02_sfnt_off00015132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1