Malicious PDF — malware analysis report

Static analysis result for SHA-256 56007b2552ed6b7b…

MALICIOUS

PDF

86.4 KB Created: 2021-09-03 23:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0063408dafe72b5a5906d46fa7c64cdf SHA-1: 9b7490c9a566fccc0bbed66f368cd2ee2ecfec58 SHA-256: 56007b2552ed6b7b51afa6c146f24609a86e36a529812e3581dd656b9f0a19ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other unknown domains. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e688e75bf6---98854598954.pdf In PDF document text
    • http://prmakeup.com/Image/files/godugamimidiforiwune.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c53285eb108---jefogafad.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/44855783869.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/zagew.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/jexoxuworalu.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/foledagat.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/db531208382d8ad39a0dcb5e49d20a43/vutidefubawajobesasagi.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96269de9f0---26547909783.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210803081810.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/tasafisidef.pdfIn PDF document text
    • http://aimic.com/userfiles/file/ripemozukajutawabirin.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/vapugavugum.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/4584483810.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/pawedinidefamolomu.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fa8f59969---lubelasasulivolupe.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c8bc3ec14---83402434436.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c8d03c949ecdae1646b910beae757a37/45452407598.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b529a323a---5047940510.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/lopod.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc54ac7aba---tufukub.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/1c97c05aaf5ea72838993cddd60a4f20/62848256803.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/36290780562.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/kupewadulapulopivi.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/safedetonafutakefi.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610af6f306500---86099020223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=language+in+creative+writing+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_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 10668 bytes
SHA-256: 28c8e53106b84a656c230e9c0d2e10e5fb557123c4120f35f2528a6dbacbc071
font_01_sfnt_off000106d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE4 17468 bytes
SHA-256: 45db4e2a37879abc05907c67e3626cae0f1a7b363cab73644d9559f22d0910d0