Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9335381a83bbca…

MALICIOUS

PDF

150.9 KB Created: 2021-06-18 07:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 949c8efa586ea9708fac0e44b56f6d56 SHA-1: ea8d580b41a6d752edc74421a8db1366f2caa594 SHA-256: 5c9335381a83bbca449d0523d6959bab997941814ac3cbdb8417bbc33cb2c94a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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.
  • 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://swaminarayangm.org/userfiles/file/ropafizezupilediwadajinag.pdf In PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6095fe94d3---44739485938.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d44d61ebc0a84a51f2103d3c616abce0/xapamefezofanoporuxixexed.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/9dd1cf8a8ab72bbf18d8a18d200abba6/nosunudilotasesuvezevoxa.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/60448523921.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/2181fce4e913b706158bbfb7753feb06/6222921847.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/eef7600108968a5bca4ecc2c7e12b708/95480161536.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16087e034876b7---80412738862.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/68ff9b0fcd3b7c55f1eb32e3e0dcc86f/71957938792.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6e9f14c06---12684533240.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/javawawede.pdfIn PDF document text
    • http://asfalon.com/__files/file/66026889903.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/lm6vg41etu48b0c27m7e71rgh2/nanejigedadugesanumuwe.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/88376808338.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/rarobibojivixujopofifozef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=love+020+ep+26PDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EB6 26560 bytes
SHA-256: 5ce869461f1a823e6284724312b7610f3d6d4992d475fe491d382332f7137f19
font_01_sfnt_off0001f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F233 4724 bytes
SHA-256: 41f66d7848b23a3d72abc90f10eb6b33a93d7dcb6d370db903a7f01a6ff5d4bc
font_02_sfnt_off0002026b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2026B 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_03_sfnt_off00020af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20AF9 14576 bytes
SHA-256: 362eb1797fb81cf62cade49b9da7d76b186989d1075589d06a47983ebe30a0ca
font_04_sfnt_off00023857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23857 16148 bytes
SHA-256: 51babe3b44e703ca5a92278b053c112c5c116674d3b708c8e2cb3e4aa6bd9a04

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