Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c66a3dd72c658a…

MALICIOUS

PDF

72.1 KB Created: 2021-09-27 11:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e4591a59f6aaab7b59557b37da648ee6 SHA-1: 2ff7013dcdd58c6784c1bbb0932d6cb98b681bca SHA-256: 93c66a3dd72c658a9be867563f5ddd7c830e0de617c08cd36c551d5f2742395e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains embedded JavaScript and a high number of external URIs, many of which point to compromised CMS upload directories. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick the user into installing a fake browser update or extension. The embedded JavaScript likely facilitates this by redirecting the user to malicious sites or initiating downloads, aligning with the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://nomylo.ru/uplcv?utm_term=enter+the+gungeon+backup+gun PDF link annotation
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f2b19410a---69830822664.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130fcd1e85a9---zijinavijitowuwaxu.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/66114196739.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/1fef9d2606a2972a6051874757aabc9e/sezema.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/sinosipax.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16144968b00f16---2517132396.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/0f087dc7d429a0de5e9415e45cb06bc4/gelakiminudol.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/859838068.pdfIn PDF document text
    • http://cissi.it/userfiles/files/35056855190.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161498361db5ca---bimowibelis.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/95920475625.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/zamudebus.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139c7a6f0733---82953404801.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/31609580859.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/wotazakamaruwifipijajeno.pdfIn PDF document text
    • https://spyboarcams.com/files/81705957771.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/rovogozirobiz.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210902_47b84.pdfIn PDF document text
    • https://phr4u.com/files/95291609165.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/denazozifu.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/25268156699.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/muzusuvi.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/3428377483.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/29875511617.pdfIn PDF document text
    • http://synphabase.ch/upload/file/72626273001.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/2962694828.pdfIn PDF document text
    • 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_off0000b499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB499 10664 bytes
SHA-256: 664e2cb9811dd70803cdc987fbc533e87f545672dde611f9afa201c344b4a37f
font_01_sfnt_off0000ccc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D8 17244 bytes
SHA-256: fcf2b7b5139c3815023e35120c10240517da6b0e3dec22edbf50998b1f2d9c0e

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