Malicious PDF — malware analysis report

Static analysis result for SHA-256 4216cab6e2e1b97a…

MALICIOUS

PDF

73.3 KB Created: 2021-09-24 17:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 137e001ed514a5614ca2ff6aec76092d SHA-1: e21624bb11538c0e67f0a8fed203572f13d04ad0 SHA-256: 4216cab6e2e1b97a7ad8b2f24e825b6fd7e56566c29aaf5e7f03b84c2169da23
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicates malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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 https://garglob.ru/uplcv?utm_term=letter+of+recommendation+for+real+estate+agent
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137834583c67---54858168499.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16145332c98cc3---97698408238.pdf
    • http://fasson.vip/images/editor/files/jenaxonogewi.pdf
    • http://snieznik.pl/userfiles/file/pofijokonesolumufewipawa.pdf
    • http://leaders-adv.net/userfiles/file/vudavadux.pdf
    • http://grupophi.es/uploads/files/30060355435.pdf
    • https://grandplaza.bg/uploads/assets/file/kitiwop.pdf
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wasovodobogoja.pdf
    • http://steakpluspizza.us/userfiles/file/60240876362.pdf
    • http://a1-automotivegroup.com/upload/files/5732037619.pdf
    • http://zopos.zohukum.com/ckfinder/userfiles/files/40972408544.pdf
    • http://ppfi-online.com/userfiles/file/pawiz.pdf
    • http://neoneofytou.com/ckfinder/userfiles/files/kubefobasexuf.pdf
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/xizux.pdf
    • http://drironcat.com/images/file/1316969408.pdf
    • https://bobecoingatlan.com/uploads/editor/file/xopojijolamuwirefigikel.pdf
    • http://tele-klass.ru/i/upload/files/50630688527.pdf
    • http://songpinhao.com/userfiles/files/teviboza.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161432a6197b84---22590184039.pdf
    • http://alt-1c.ru/userfiles/file/36441821389.pdf
    • http://chromowane.com/userfiles/file/folowirubetujawuxalemu.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4a05ce6d46339fbebe44408139d8499e/12147312215.pdf
    • https://plewmal-d.com/Uploads/files/goliloponogazud.pdf
    • https://associazionebriciole.it/public/file/vokogizanude.pdf
    • https://menlopark.com/wysiwygfiles/file/3537118161.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DB 16792 bytes
font_01_sfnt_off0000d0f2.bin
8d03f1a7b66e70f848453987fb7731c4b676aacd2869b97094db70f1f5daa486		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F2 10776 bytes
font_02_sfnt_off0000e980.bin
a1ddaa80a5a333f00d951eebff27432101aa794bd02aacef4b799d6b02c0a356		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE980 17676 bytes

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