Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac4be8bb96b8841…

MALICIOUS

PDF

98.0 KB Created: 2021-08-31 18:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7208e91b902235eb2430f61e3949fed3 SHA-1: 197f71085811e396177f1b18f9be0f118a49eea8 SHA-256: eac4be8bb96b8841f1a9c01349cfe7c94117a8cd7cd1edb6c6576b1f4adbc75f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which appear to be compromised WordPress sites. This structure strongly suggests a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://synerhu.ru/uplcv?utm_term=list+of+books+found+in+the+dead+sea+scrolls PDF link annotation
    • http://www.sosonomo.com/ckfinder/userfiles/files/2565880925.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/92693331115.pdfIn PDF document text
    • http://clinicscrm.com/img/files/bozoximoxetuvor.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/pibosatuzekozi.pdfIn PDF document text
    • https://triosms.com/userfiles/file/zasib.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/91134927174.pdfIn PDF document text
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/22485150327.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/afd6e9269678ce14df297fbd8b7c6744/68584619652.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/senezazekiwibuxisanital.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160724e80bba02---ketoxuva.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/6066452743.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/24666199145.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f58800550d---tamularatenoweb.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/difipukixu.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/t283fj9db34n97ssils89rbupc/vesozepenagorajexufugili.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/redezovogatarumofefowej.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bb7c0bd2d---53626118097.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/xijibobo.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/50519a06e808e4c3e904ce79a6e71875/sariroji.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/xolazegis.pdfIn PDF document text
    • http://teplospectr.ru/images/files/xesir.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/16269377821.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/22381914748.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/fisutib.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_off00011764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11764 18832 bytes
SHA-256: 6e34affbc854e058d8f322e68140f5568853af4d878021ae39ee09e2f8eabdd2
font_01_sfnt_off000148b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160C9 10860 bytes
SHA-256: b761a04e9c44b7c172755254a724f14fd3edd124b78d9054f1baf30161349ff5