Malicious PDF — malware analysis report

Static analysis result for SHA-256 25cd79a724fffb1f…

MALICIOUS

PDF

83.4 KB Created: 2021-10-13 10:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d2ba82201007e185b7899c30e67bf814 SHA-1: 87fe1f3a3e24485af314847c80182b965d4e06b9 SHA-256: 25cd79a724fffb1f402a63c3eb36aa66478b11407665f1309fe2885abeebc293
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript stream, combined with the ClamAV detection of 'Pdf.Phishing.Trojan', strongly indicates malicious intent. The ML classifier also returned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://esistore.be/userfiles/file/26256033026.pdf In PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/67132699843.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/dixuvebanalifamunopage.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/73760980665.pdfIn PDF document text
    • https://motoralbini.it/files/file/50479995578.pdfIn PDF document text
    • https://seerupit.dk/assens/file/62849813094.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/rorum.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/wazutobukipiwelabogoleroj.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/wajilonevezen.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/jokijimere.pdfIn PDF document text
    • https://alertsecurity.in/ckfinder/userfiles/files/15297282827.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/idfbfv602t6bkiqm6r0eo2s635/buvetovagafipa.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109191848302258.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/viwajumemomipulinala.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/836e590f9acc68b6d4a824c443dc7f0f/xolobiveremelopolivuvu.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/3763861940.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/wejisolamavax.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/53126055599.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/gazilesulerideda.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf88b51c82---konebezasotizide.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/85705629288.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/37918814581.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/12031841905.pdfIn PDF document text
    • http://cecev.com/stockages/files/81121148885.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/rugirifoxovibijelodafi.pdfIn PDF document text
    • http://bptramptour.pl/files/file/49611890502.pdfIn PDF document text
    • http://madame-tina.com/ckfinder/userfiles/files/84239283235.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/7xhmvLXWVJc/uplcv?utm_term=grand+theft+auto+san+andreas+mod+apk+free+downloadPDF 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_off0000dda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA0 10988 bytes
SHA-256: f9492a2eb498d3cd7242289177dfa9683f3b12cc4891e5a7de6a3782c4ef83ee
font_01_sfnt_off0000f706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF706 18520 bytes
SHA-256: 2b6a481d6816481f7b5e4a7e70cdbbac925db26e92c37edc54bd1fcb36b6649c
font_02_sfnt_off00012712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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