Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1a034dd465ee2b…

MALICIOUS

PDF

89.0 KB Created: 2021-09-21 17:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a9eb802eccf67c81faafcc3a1f148c2 SHA-1: 29fb13fff49d91e94eb2ef920bbcb441e83d5388 SHA-256: be1a034dd465ee2ba8478e5c50d4dc5e31ab98c885618fef9b53490858b1e6c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be directing users to potentially malicious content through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0f66a2589---fatila.pdf In PDF document text
    • https://vinocastillo.hu/editor_up/tasewelen.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/80739961387.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/33470734186.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/boxugefekunuzunalopegite.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/mavudovunekefitazilawabax.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/bitulitutijatubof.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/pomevatekizojevoragaxon.pdfIn PDF document text
    • https://kimcert.org/E/file/56426244127.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/87682610615.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/dfb276c7a9be5b444c916faa49ea90ce/10517157617.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/fibugirabisusarero.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/sukelawukas.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/boveralavazosi.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/vodawibo.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/wiwisada.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/pavupemesemezudurujavetad.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///dubonutox.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/setoponalen.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/sugufajexa.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/544dcf7689d45c72aba2d6cd17559e37/14867661170.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614094fbe4ec1---64764529788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=it+full+movie+1PDF 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_off0000fc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC57 16988 bytes
SHA-256: 5002b377d7474e1d7c65d239d54757fbeaeae4035b4a0d66601922b6a0899900
font_01_sfnt_off00012850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12850 10008 bytes
SHA-256: d7d8d3056fa6ff45f06a6472cf9ee42fd08ec3c6c2b4c19ffd5eebad4a310b7d
font_02_sfnt_off00013ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1