Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0285888d705bb7…

MALICIOUS

PDF

97.1 KB Created: 2021-08-25 07:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3a5468b92fef839217518b38dc0d6fa9 SHA-1: d163a94fd4f164d4a677c7b815da1ee131c1eb3b SHA-256: bb0285888d705bb7ac0f029bfd818d760a6d92e7c5a5a6b433dc939543a0e32c
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to execute code or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/d2ff930e1bff132619b34aa1d80afdaf/tamovukefuba.pdf In PDF document text
    • http://daeryuhealthcare.com/ckupload/files/zetujarorejopa.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/guvateretifugagulatoditob.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/mibatojazikajakixaz.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/6f2766a1216ca2fdf97c5ee243db8cf2/vorenemupivojurorurabo.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/lezukuviporizolodezafa.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/lawezusomolizuwik.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/37157052757.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/31747108139.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/np3u3hj6g6mtuaoe43012kt5ps/36390090394.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/vedifuguxoveweludobobof.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/pisoripad.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/66179384270.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/12403700043.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084e6e010810---vodiwi.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/wokafivujuzagewivuwo.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/20838130895.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/falinusixufupoj.pdfIn PDF document text
    • http://rochesteradams75.com/clients/7/77/774a1ed2e17b5a3c8fe4214cc08eab78/File/3516118300.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/fawuxenenafavekaliwof.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/lesaf.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/42702465706.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/fikuzamomanagimotuvub.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97d04480a1---zepazeluduvivi.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/67681111444.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888eca2959b---83392586192.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c771b57ae8c---zafenunadupojovap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=applying+international+financial+reporting+standards+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_off0001168e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168E 17480 bytes
SHA-256: 229babe97046bcd9a173d761f0b758727584261bba8441a9827e3e3cbcfd3413
font_01_sfnt_off0001446e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446E 10892 bytes
SHA-256: 5e085aa69c91f9194cf1c430b2feae4a2967bd23293011b482ffc6603276d610
font_02_sfnt_off00015d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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