Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea0766d6f0650c88…

MALICIOUS

PDF

115.1 KB Created: 2021-09-07 16:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f2f272f8999baa3be4e391feee00d9b6 SHA-1: 686a889ec439eec5c97584c8d88702797354e1fa SHA-256: ea0766d6f0650c880168b1a49dd625b1d9f5616daa24beea690fe4f7592acc1a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute further malicious content or phish users. The presence of embedded URLs and the 'SE_INVOICE_LURE' heuristic suggest a social engineering tactic to trick users into clicking malicious links, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://chinalabware.es/d/files/vejafilogekapatosibid.pdf In PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa3b5eea17---rowulijulapifiw.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/najmql55ie2kam4qksfm68u02l/53721070744.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/8623723530.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/9evmvm452mso2r4ckqf1150ioi/59137351693.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfe6d815ad---91461417054.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/80114714016.pdfIn PDF document text
    • http://srhs1980.com/clients/877094/File/878354824.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8a0bd206f---webejurefoneberirugopeno.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/wutifugudogulexawumul.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/puraruluduput.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/vivesudidotemu.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/124c62962c4f4ae9c6d724e7e92fb374/bodejajalak.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/7864823196.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/85995192005.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/37e298e6fd5c0445e27737bd9935fbb4/suzozegid.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/viwavorek.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/12575436414.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/wavutovovajujudutivo.pdfIn PDF document text
    • https://agrando.cz/files/file/73064326458.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/02516388ba8e8814d1c797dd7823d74a/tegagowuf.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-17/images/files/kodutuguvumel.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ad59a4217d75dbb4d4fde305e8db24d5/sepakatogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=funeral+biography+sample+pdfPDF 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_off00015af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001730d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1730D 11180 bytes
SHA-256: 919eb5a3c389373e94ce45ae7b64887ddcf21a2df828183884de9e356d9160a4
font_02_sfnt_off00018c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C7D 19784 bytes
SHA-256: 9be41bdf73dae856f5d09367bbd2e93554ec79b369a92cf9f680c810abcc99e1

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