Malicious PDF — malware analysis report

Static analysis result for SHA-256 d766e59e81b727cc…

MALICIOUS

PDF

72.0 KB Created: 2021-09-25 22:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8eda2fe9b72dfacf1ff41bfd1ad1136 SHA-1: bb21aca958fabb8233939560fbee3499001b6687 SHA-256: d766e59e81b727cc39fbfe4c1f920d369b54fecf1828c69ceb238e8e2c7881b9
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect the user to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ecotranslation.ca/upload/editor/file/26813890184.pdf In PDF document text
    • http://uhorder.com/upload/files/55027465138.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/molizobegukevisadubil.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/dejevejexe.pdfIn PDF document text
    • http://thevalleytrader.com/files/masujogirif.pdfIn PDF document text
    • http://zuche0551.com/upload/file/nagumoxakexevusidol.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ofhb9gjlq9jl3ta5dkcv7ca291/20768978997.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93421102687.pdfIn PDF document text
    • http://e-sheremet.com/img/79783434063.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/kexudipotapubulesomunovef.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142f0b0c967f---duxetawinaj.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/99176353051.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a39e2c8a3c13db6474c0c0e9f327ba3d/31783616654.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/17638821490.pdfIn PDF document text
    • http://espokebar.com/uploads/files/lomalu.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/1433477619.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/widobil.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/bozojevogozekubegakuf.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/52404429470.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/75138038392.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/79b7e32c9b827afa7b5c2c2064e3a3d6/wexavefufugufavupuwiro.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/sbm663kra4snlb2jteeh7b7i5i/62700915466.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/sijopek.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/47989405990.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/89341048163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sim+card+change+notifier+appPDF 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_off0000b3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBE 18176 bytes
SHA-256: 76ad424da34e7e161fedb1eef07f287c7ee25c967e0eea11201f20dd9efbf53e
font_02_sfnt_off0000f9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 10928 bytes
SHA-256: b0c5f6d157e9768ab22882d2293982cac46395348a835ee37bdb6dd83a6c4536