Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d54df2bb44298cd…

MALICIOUS

PDF

126.5 KB Created: 2021-06-28 22:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b933fc7fa0ea2294af3cb9a2842cf00 SHA-1: 3da9605bca76b4a44166241c848b7cc1207160c3 SHA-256: 3d54df2bb44298cd7e41f30e92a1740f8a64c23c170bbab0522d6cf47d4a30bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, suggesting a link farm or phishing operation. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule further support this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://coretry.ru/uplcv?utm_term=back+to+school+bible+verses+for+teachers PDF link annotation
    • http://atek-ent.com/upload/file/78714078482.pdfIn PDF document text
    • https://brod-plovdiv.com/images/11094844479.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdaace2fbb---xozepi.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6a3e56c14---12010134724.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/4797474261.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/91082670073.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/27407974285.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/nuwutugitetipaserid.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/34761157461.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/gizoxegevodinin.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b65c6cba1c7---pirexevunufusuralakener.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/0095da1e1d9de50d46a7bf71110a7c27/pipeguduw.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///64349434601.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/samumodaxofala.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160d62a6723d51---1449378727.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a812b291fb---17529651909.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c42d9ba6f38---43491841293.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/mfmuc1mbajf9p5dbfmfqrh2uo0/10269830339.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a9c7e0ab5---kivekojirijiletaje.pdfIn PDF document text
    • https://mfdesign.hu/files/file/99794218936.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bab1bcd917---26881585107.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/20421051091.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c109ebe8ac5---vexasuruxinuraze.pdfIn PDF document text
    • 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_off00018cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4D6 10680 bytes
SHA-256: 3b2e110387d1fccc2283ae83a2ba7b4697857ef40b72bb89bdfaf6d14cec80b3
font_02_sfnt_off0001bd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD8F 17904 bytes
SHA-256: 1a315081ad247d415ef81b15ab06a7737a2e0ff3a6041fee8d3185ffd1c043a0

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