Malicious PDF — malware analysis report

Static analysis result for SHA-256 61093a45c720c6d3…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 14:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 82b362e0a249d6ba59cdee48f1faaa52 SHA-1: 15592043eed420d98168cf1a8db35541e42895b8 SHA-256: 61093a45c720c6d3eb00558cbcb2f0d05d1decf286e6ab7ef4d477dbf9bc73e1
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by multiple heuristics and an ML classifier, and is detected by ClamAV as a phishing trojan. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document likely instructs the user to install or connect with remote-support software, a common tactic for gaining unauthorized access. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a phishing or credential harvesting campaign, potentially leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://irlanc.ru/uplcv?utm_term=how+to+operate+a+phone+with+another+phone PDF link annotation
    • https://drrajanmahtani.com/userfiles/files/54308568328.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/77707417271.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145810202548---49094440641.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/najeli.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/43011181324.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/vekoxudodafexorelojebeta.pdfIn PDF document text
    • https://beaszemin.com/files/ridop.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2c1951302---95876582104.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137074c62e44---fopewezovawape.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613792eda6bcd---33956246759.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/fc7472161ffac43c65a188714f0e5b17/70934348449.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/dbd114562bcee08bb509249477a624b1/90612170184.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/larav.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/tiwapij.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/78553319080.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/68892926981.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/zupozefomavetakozamesi.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/50237092506.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f664f287ce---63730869830.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/feperuvakarunugegepedoki.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/sixigifazakixupowepuv.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/48497387658.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/27212151007.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_off0000b065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC877 16620 bytes
SHA-256: fd0d8e757c01656b07b6e6c60457d755f7e44df6ba0d8db13fbcbcb25653be65
font_02_sfnt_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 10212 bytes
SHA-256: 5af7da769a214d3c653d2e8c6385ca49b3c285f7f430bc3a760128ab3ee66e24

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