Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59ba331efd69d27…

MALICIOUS

PDF

88.0 KB Created: 2021-06-27 21:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 605f19b301d67ce1025f13e7528c2b26 SHA-1: 9b7b8d8c29436101756e2ffb26e8faa0f9289e63 SHA-256: b59ba331efd69d275ced8573d3fb26b810d1a7cb7d920391c24928b587632016
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to host malicious payloads or facilitate phishing. The presence of these links suggests an attempt to lure users to malicious content, potentially exploiting vulnerabilities in their browsers or tricking them into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/8c65342ee74c5b77991c9b7a1dea74f8/65118513800.pdf In PDF document text
    • http://51-lq.com/userfiles/file///zotuwagewurumulidugefiwu.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7e9c7122a---xaloruse.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3477e793b---mesigigaboti.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/9vos5184epmuvploidmoldniqm/16943439006.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/6kbt3k7ac95mitnk2mptbv0i02/mujomisisuduniwago.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/2obqn09hce7vu26b213fun4qdf/rezowokoxadosubefikeziru.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607afc7c143e4---56205209582.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210621_072C621FDD0831E5.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c176b9acb---50868512518.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/surir.pdfIn PDF document text
    • http://ruresept.ru/files/file/lavulezi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6502298b---95546309134.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/dcd6c4ca2a11b2a54c4090698c743726/35779109947.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e0d4b5be0---65529792387.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/folajotafidedusuvatun.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c076251c956---98847587704.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/womepidezofuputakavud.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/bowenedi.pdfIn PDF document text
    • https://andrejc.si/files/file/51725965323.pdfIn PDF document text
    • http://kidneytexas.org/clients/861060/File/63331033866.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd34fa82ad---88093707463.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/gaporuwezutopidaga.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/zukimepisawatolovodix.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609825bf9a0d6---tukezafuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=watch+my+cat+from+hell+online+freePDF 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_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 18144 bytes
SHA-256: 2fd872f27a43cc3fc518fe2f3915363607145d314b4bc8255e3ad652d4ee6288
font_01_sfnt_off00012105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001391c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391C 10540 bytes
SHA-256: c21e0c01ed361450c638801b98d0bbee75212ab1e02d00603bd64dce85e370fe