Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ceb6884f4e4445…

MALICIOUS

PDF

77.3 KB Created: 2021-09-01 05:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0e2f54bb87ae20f73021cbeeba151565 SHA-1: d7fb763e2b9df6e079e9a983472582866a4d6e59 SHA-256: 86ceb6884f4e4445954135db180a008dfadbe6a24d6354eefaa5fa6a19b35d79
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress uploads and other unknown domains, suggesting it's designed to lure users to malicious sites. The PDF structure and embedded content are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/4e0fa29e267fec5db4598bafd58b1f5d/47070167423.pdf In PDF document text
    • http://rilta.net/userfiles/files/duwetoradirulumamo.pdfIn PDF document text
    • http://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/77569391794.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/87967266641.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/kekerebesop.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/zizokim.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/25742568851.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/99868386007.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/poroxubetawija.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab0b43f31e---fuwudef.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/94455332677.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/62766745754.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/275431a33e9b961e188e1566ac7cbe33/luxaj.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/945633665de6024ba817c1d5bbb4b18c/dakorev.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/boroxibu.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/72211944479.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/kenewejisoluxavu.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/99216246306.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/46286121396.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/nototirevurelonoz.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/rimixozuno.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/73197437538.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/jixulerikixerupuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=hope+so+meaning+in+tamilPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/xaxeji.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_off0000c357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC357 19896 bytes
SHA-256: 9b9906d660dabd5a085d17ba237aba033e6d8111e031fad420664f0e87dd51e4
font_01_sfnt_off0000f757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF757 10488 bytes
SHA-256: 7eac66cb1ef823f357ee3226ceaf3e4b783bff7c9978c5bc2c9a2e82703fc556
font_02_sfnt_off00010f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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