Malicious PDF — malware analysis report

Static analysis result for SHA-256 58bd941163f89395…

MALICIOUS

PDF

85.5 KB Created: 2021-09-16 22:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 247128f5d8647d4eaa4cb80a4dda0e28 SHA-1: 04d03d0986f2565fd9c29dfe38dd13184ea255e5 SHA-256: 58bd941163f8939564fa00b4b769c2d13b4ebb6bf3c165bb7d8e8bbe6c49875f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) suggests an attempt to exploit PDF vulnerabilities or perform malicious actions within the document itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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 http://suvagcentr.ru/userfiles/files/fojubasagavutavewodi.pdf In PDF document text
    • https://csp-pub.com/stockages/files/15755111743.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/97900315643.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/45115689597.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/38209953515.pdfIn PDF document text
    • http://entrackintl.com/uploads/pakepugitegesejazofegupox.pdfIn PDF document text
    • http://pinxedien.net/upload/files/sefosakosamixom.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/fekakewigakel.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/11464724553.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/61910bc2035e7bdd7063da275a0e1530/17037086886.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/xotigimebedigolaviruw.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8d31ec32---tabijepolufe.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/71570233221.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/2287951919.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/zowedadolakubogufes.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/ferisukijezubogilijuvu.pdfIn PDF document text
    • http://mylodge-naoshima.com/vuvizufofapokel.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hdbqhk0o2tcog8o4alkis9i2k5/lunusolufajidizapozade.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/82740029887.pdfIn PDF document text
    • http://linker-apps.com/files/jewozifuzuzuveme.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/12044578391.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/zoxufutoga.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/19587604851.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/pimeletazurafomivibaridut.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/7922950458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=wiping+android+phonePDF 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_off0000eb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB55 17620 bytes
SHA-256: 263ccbcbf505d90cc0f0d9946e63fe16c61edfbcced4b9b80902c743f39a4a7a
font_01_sfnt_off00011961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11961 10352 bytes
SHA-256: c458d9d62e1a854e989cf1cdd02ac8586e11c9bc7dd8e3db44a56662fa60c822
font_02_sfnt_off0001306d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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