Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a64e4aac96efb6…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 20:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f489a8b2f8b685b97b1486c8e40e975b SHA-1: b348415fbecb26020cf6d2185a97cce69dc126cf SHA-256: 67a64e4aac96efb67dc5e22280051f6db0006215b71a64abde519596db7d881b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, appears to be generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the lure of a PDF reader or similar utility.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=pdf+reader+like+kindle PDF link annotation
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/m9o7b7t1iulf6k35ef9equ1q7l/44925005909.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/4ccik9cnq007drac3ijvtutfoi/43181887955.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/nodusutelubumorafaku.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/fapaza.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_16_19_16_14_7233.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/befulabolevewopomesume.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/timonedewuma.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140663241650---zamumelonemefozidipage.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/74279272454.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///gimubemidanugazilu.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/vefabapugadokowosuderes.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2dc31cf2b738abbb7f0d3abfbe1bab66/fatifujixuwi.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/1355478049.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/xovoviwetidexugemexemi.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/41506779036.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/13497883803.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/36757693479.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sexurivafusenaru.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/16673176813.pdfIn PDF document text
    • http://lulanjina.net/upload/files/jiwiduzojejugowaxevusuji.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/28797789133.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/66474757039.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/loguteka.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/32984035803.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_off0000d617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD617 10056 bytes
SHA-256: d6bc37bc18aeb2382455f524d28f0d3be9213b9c1e0227e570fa69758dcbd3f8
font_01_sfnt_off0000ec74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 17124 bytes
SHA-256: 0cced948635f3fa9bc2ad35a23e61e7d9afa392a5ffd1ba279e28a1751baa83a
font_02_sfnt_off000118b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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