Malicious PDF — malware analysis report

Static analysis result for SHA-256 18084661aea381c5…

MALICIOUS

PDF

87.1 KB Created: 2021-08-15 10:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 36bd4585688fab18ade1646b060e46e7 SHA-1: e7d4d1d97c3748bac81c5e627d03ef30b86f2742 SHA-256: 18084661aea381c54d9d8685d27174151cd7c69f3d05cfc017b3cf3e1ae3e7c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to various PDF files hosted on compromised WordPress sites, suggesting an attempt to distribute further malicious content or redirect users to phishing pages. Although no scripts were explicitly extracted, the nature of the link farm and the detection as a trojan implies malicious intent, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082a7f739803---dapige.pdf In PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210623003632.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/guxetonulizevowib.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608797d1a2620---32737867580.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/porusamozamav.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ae8ba07ee243128fe025b90a01e55f7/81975094626.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/72288632275.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/53535250270.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/77045635192.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/18595679075.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5d337a1b5bb267a4d6290b616b27c43c/nagazapedatomuv.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/fa7add16d1007f3a38a1094534966505/34245409282.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adf5a4d3e3b---tasiw.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608800f2f2e54---kixal.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/2b34077d26ca8e1dda9aab04f54f135a/64208212748.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/ronugugeminomufuwofokuzik.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/xidadoparo.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/ttaa3hefnek0dfmd5tuaskvkb0/52199477232.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2470a61982---konesivuxexojamili.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72979004c6---xiritugoxupix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+recommendation+letter+for+scholarshipPDF 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_off0000f3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BA 10880 bytes
SHA-256: 0812a950ce7ac00e8b8d30a6db30b7e55a0c095c1449dd96bf4a232d7c90f214
font_01_sfnt_off00010caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAF 16360 bytes
SHA-256: 064d5db4e7c5ba968915aeb5fcf1d37578ad5086c01b5059f49005d248cd4192
font_02_sfnt_off000136bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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