Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec08e83ac495a2fb…

MALICIOUS

PDF

92.4 KB Created: 2021-06-28 04:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7eb160eb8a76433eb5ad45142a48273d SHA-1: 5f1bba9817a4aae259fa6fb75a4825e1047d47ff SHA-256: ec08e83ac495a2fb47fe3543e5997c8eea94805792124c3c6f307baab4bf50a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress sites, suggesting it's designed to host and distribute malicious payloads. The heuristic 'SE_INVOICE_LURE' further supports the phishing pretext, aiming to trick users into downloading the embedded content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/gud4v23djfpfglts5m8cjpvvo1/sotipojorezanegekikego.pdf In PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/dadd85e93450a86b5c7779d6a1b93185/legexenidefelojaguvabozeb.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/wugigifowonavaserot.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b4a71331977---nesutexopemaragij.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/todogifuvexanopesalorapex.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/90330307957.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///43394745298.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/bqcohr6nm3gm18q6cgodbig541/segafobegenage.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/2643211fae873a08a195322efd95f8b6/20997869831.pdfIn PDF document text
    • https://polandpools.com/contents//files/22492470668.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091a2d29569e---63316694348.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/5eed6caf02292bea172d690cff8b8d08/20567597668.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/zeziribodufudujajumolim.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/282ecde2613ab8d15c77a173df117a0d/52731069500.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/43606cd8cda45e425d49e6dce2a9108f/62369836863.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/xugotogapiratewowum.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070dbe1d45f9---46791230820.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/665f1e69bfc2e95b424087f8afacb2a1/sirofevarezos.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/43184081586.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210527162212470883.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/pilagalulujabaj.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d9192247638---ripemilekigijegelinodoso.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/6a8a9861e7efdeefe0d2b7a1b28d51e3/3715747436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=according+to+gaapPDF 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_off000105de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DE 10324 bytes
SHA-256: bc2f5ef7e5d6c36d7a99f154acc72db094554a64f94ac43b307ec40e1c14ed13
font_01_sfnt_off00011d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13521 17384 bytes
SHA-256: c30a8a53bd7a86059f76fc1858c5a4affbed2a2dfa15890992fab6241828fb28

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