Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5977f24ed05d40…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 16:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cff614f35d0b8f90adbda270987db4da SHA-1: ed0bcb793940377f020517efb7af59a68890ac0e SHA-256: 1b5977f24ed05d409278f40373ed18b4b5e46d95729f9216d6e9cd1f98e2648c
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://mytekas.com/UserFiles/file/62454875369.pdf In PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/76025678e4545edc45f24c69b4c63572/90267083963.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/vomifaji.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/govotepufalile.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/gasozojigazudix.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/78535436567.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af32ea991d---10682823626.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/88041467097.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/33335116559.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/pawuvivagogewafewove.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/sososarevenuninol.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161414aaf146db---94371118104.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140646455a3c---lafududodizepozo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e71289b213---zifusomog.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/24220373872.pdfIn PDF document text
    • http://agilesolutions.in/uploads/muxiwoxataxanutu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613389ec6c26c---56563537255.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/h22vq42tcl1fn489e3qqgidqq5/89437619072.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210908210219.pdfIn PDF document text
    • http://halanmilk.com/upload/files/zoxobafebejuru.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/kewavi.pdfIn PDF document text
    • https://emenu.hu/editor_up/11473765402.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/23924703993.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/delujinegaditimebuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=random+ads+popping+up+androidPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/falef.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130becf4ac4c---xobugazaden.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_off0000decc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 17232 bytes
SHA-256: 5ea7285d9e1e511f5e17168e7067f191219301e24f0ac8bb0beb6c6490cc4a53
font_01_sfnt_off00010baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C6 10604 bytes
SHA-256: eb1e943c92faf313a02218fe8abc0169b1da8d4657b979ce6b4df7422216a694

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