Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ac84fdbba4adc8…

MALICIOUS

PDF

73.3 KB Created: 2021-09-04 06:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3291ea6cf08534ca4d8e8a3d7a211efe SHA-1: 4cff90819a8a9cf38eb906dd56f1937b69cc84cd SHA-256: 41ac84fdbba4adc81c44d3479dc3ea9e9947629a2826b8a3b450e0b953cd1f31
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to external websites, many of which are hosted on domains flagged as potentially compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on potentially compromised CMS uploads suggests an attempt to obscure the true destination or leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a67e02b2169---19785159688.pdf In PDF document text
    • http://quatanggiabao.com/images/uploads/files/tozeg.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/nivasesuruvanadakaxo.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1628390240.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/51895145456.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/66149941069.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/6a681c5d9f47ff0b73dce015b3f56cea/79076002015.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/zafate.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210709_4974ABABF12F9105.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/59865440c80da318df5fb0744542696b/8921486621.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727578a0432---xotupobexilujas.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/rodogebudififafewewa.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/94449966829.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/50609334071.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/metagabivegabomusev.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/nitobuvevinatil.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/sugowewokadewixujazosod.pdfIn PDF document text
    • http://nprofit.hk/userfiles/82406708331.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084480018e0b---jesobitagogujetoxojo.pdfIn PDF document text
    • http://www.celso.org/download/98194839544.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/68667638543.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/34921900483.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160985c58889d4---gitonozotefasetew.pdfIn PDF document text
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/wevubitapaforivobula.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074191db4d7f---miwagigujixazepulebowala.pdfIn PDF document text
    • http://nprofit.hk/userfiles/97803311925.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/kar1jr56hl9k16ae0plfps9cqb/40035547531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=audacity+mac+manualPDF 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_off0000be63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE63 10204 bytes
SHA-256: f2be33354a2e771e2b0673cd829bfbf5636181bbeeb5050f4a427bd3398936b6
font_01_sfnt_off0000d536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD536 16464 bytes
SHA-256: b4e2cac088cffdf11ecfa51f0d0c5943aaec2b19efe3f12b560b9529b5b21242
font_02_sfnt_off0000ff88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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