Malicious PDF — malware analysis report

Static analysis result for SHA-256 78816c76c8fefc9a…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 13:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8329089be31089604b0a93975fca56a5 SHA-1: 00ccbd8ed9f478dbd717fd1cbe2d25bba5b77dc1 SHA-256: 78816c76c8fefc9a0705d47dcf00cb1697660a19a544fde2d15ef43fb6f66076
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of multiple external URIs, including those pointing to compromised CMS uploads and link farms, suggests an attempt to obscure the final destination and potentially distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://skolicka.eu/foto/images/file/telomivedowovogaru.pdf In PDF document text
    • http://riverla.vn/uploads/userfiles/file/kamebibewirotuvasibi.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/77896698437.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614029ae96813---29681433296.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/96703898442.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-10/images/files/28593433494.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/42746566950.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/sufixajesunesetanabita.pdfIn PDF document text
    • http://rococosofa.com/files/files/98990210023.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/nosetopolitarikoxav.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9ef754017---16873938411.pdfIn PDF document text
    • http://trivio.it/userfiles/files/41534070978.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/55417102539.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161302f9602c1b---rerixopegepaxevasev.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/84505443692.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/45285582639.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/sekolejososowatedufovew.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413bf3af412---napitisesejokodoga.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/8378226205.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/f59eaf28337a3d6db1389291a80ee65b/73261323568.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/21460932614.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/safivolemanokovigenumav.pdfIn PDF document text
    • https://onlinendttraining.net/files/zuwuninitefote.pdfIn PDF document text
    • http://sb-78.ru/files/file/12396160179.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/55597009603.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/5344de785c8c42a8e19feb5eac066f93/24334785773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=naan+sirithal+movie+download+isaiminiPDF 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_off0000ead0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E2 16564 bytes
SHA-256: 7daaff7bb8187bb961e15bfd8f5de2418d26e3b9e79fa9cdaf326eb9bc31971e
font_02_sfnt_off00012de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE2 10640 bytes
SHA-256: b252a0c87eebdd4071bcd1072b0fcc2d3b430002334d6391b0bde1e240ec6a27

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