Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b2268bb1b91cfa…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 11:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d1b6c173e95154179a0e742376bfe6e6 SHA-1: 29ab0b97120d9cbb2fd555cf7ebd69e4f166c782 SHA-256: 65b2268bb1b91cfab511e9e0935940bc13ab983e8039f11ddb8b6b6e85b37e3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting a phishing or redirection scheme. An embedded JavaScript stream was also detected, which could be used to further obfuscate the malicious activity or initiate further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://optimaglobal.net/ckupload/files/vubedomudisunexeponanexus.pdf In PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/gutigagobexogivujebudixix.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/89650616082.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910050402.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/vemavixugef.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/98157196471.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/39i6ldm4omglk4q9lph3k6g770/52218516350.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/ponod.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/60938134517.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/47972965022.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459dabe3817---xovaberasopawizenis.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/63485582951.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/50499884220.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/94999977754.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/93077400198.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/71725954745.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/rjkatsasmtom89eu9tnt78navt/49500209514.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/tu8r3upkhm0sj9buklb17roi71/17800109441.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219191152485791.pdfIn PDF document text
    • https://adikmanis.com/contents/files/vofitorujuwirewum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=dark+theme+on+chromebookPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/75489042730.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_off0000d33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33D 18108 bytes
SHA-256: 182f04a0d66f79da51816052bc35a698153f5e8e5089c2912aeff9c8f5f96946
font_01_sfnt_off000101c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 10424 bytes
SHA-256: e8a70e0297232f2b368c1fd4aed767f10d60e54dfa0ae07cad3e5fcd92533126
font_02_sfnt_off0001193b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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