Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af230e99ce986b0…

MALICIOUS

PDF

90.5 KB Created: 2021-07-07 06:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0cebc18b702f8ff19a37f9dd5c4f41b1 SHA-1: 9086f941cc2145f05fd73d835aa457e107851604 SHA-256: 8af230e99ce986b0b0fae629addac13b921ec1aa23615e34961d41c62303de37
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The PDF itself does not contain readable text, but the heuristics indicate a focus on linking to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.bash.cl/media/file/gumubaxawoxabuvijoz.pdf In PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ibgvtihk51cc418tj5ran2u1u2/37926019664.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801b8a4ed4c---novesike.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081122c69902---24377849044.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/22512436982.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e2ba95be0---43662805014.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d0c07ca9869fbf593c252b8313b9467f/40258805121.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/83137395667.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89b215eba---91897525229.pdfIn PDF document text
    • http://effektfilm.de/files/file/xatututanekemadunevilo.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/ririp.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/46540720345.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751584124d6---74003573746.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/f231655c1d8e30c658bc4320805685b7/wuxaredotalobilupaw.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16070db54aa993---varupokegudomonibewut.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050316220828.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/bitumapupukabepela.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/lesawuzagakikekimib.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa3ee09c74---koxepup.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/67114712226.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/95tjc9g861kij16qfefl6rg5ds/wiwikezugegaxurowukaj.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/jopas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0f179534a---budifusixenebi.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/9vs744k4i28ia088q8td82efa5/vibevakewuwaguweferuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=happy+1st+birthday+to+my+son+from+momPDF 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_off0000ff19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF19 10884 bytes
SHA-256: 23a9c2c5250efa9aaa4b23a7f256c01da61cdf7964cd8ef870e870fef9c6a377
font_01_sfnt_off000117dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DD 16844 bytes
SHA-256: 5cf728c678d480dfc50e54f01ab209be6327d856ecf6207f260dffbf6e3539b8
font_02_sfnt_off000142bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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