Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1944a6335e55aca…

MALICIOUS

PDF

93.1 KB Created: 2021-06-26 03:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6308ba598f6db734705f3b4b0460ea0f SHA-1: 8ba0c82195846a7ba4dd9b153adedc5ef11d14ac SHA-256: b1944a6335e55acaee63b7a110f85e25324d903578ab374cb29029527db4fd01
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the PDF structure and link farm indicate malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be52a6bf1e6---42037060562.pdf In PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/8c33b979866affbbef40e40b0150b288/86669660697.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/hkgg5q4udts9c21j9kim92kqqc/6834105862.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/14591167394.pdfIn PDF document text
    • https://777mto.org/contents//files/nufurizumab.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/52047902671.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076586a15f6e---12049792393.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608a06d9a5ea8---65143650821.pdfIn PDF document text
    • http://bjjiffy.com/upload/52642346435.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607448d19d121---kixokitonokapagosikowiraj.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/pesimanakifigavolaruvu.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/11528522335.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec723d4b87---66916026781.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607975b6b2e50---zimopuguweviwinuv.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4059d2211ca69f8b9560d55d47c26f8f/poxukip.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/kututomorabugusitib.pdfIn PDF document text
    • https://flyags.com/editorResources/file///69136560185.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/060fbe2516f62c7f6f5e862284924ed7/nevenusojekusodisogaxu.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/kigesomapagobiniwe.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/98741236144.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ccb3b50b---74853778554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=linux+password+managerPDF 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_off0001008a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001189c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189C 22392 bytes
SHA-256: 1ac7c935a8c0aeb81f7683866fb465c6954d8b351f85126c048612ae5f6e9463
font_02_sfnt_off00014ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE4 10836 bytes
SHA-256: 6ef6cc4d0105ce4fcc223622090c622632031632d4ac9af30adb55c9b2779b84

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