Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a41e22cafdcdfb…

MALICIOUS

PDF

67.9 KB Created: 2021-09-28 14:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5ed632114bb75c1a36b235587ed5cfeb SHA-1: eb5f9ab11a928867bca33082d63471c262f68cbd SHA-256: 75a41e22cafdcdfb84407c9cba8359d9c4b34bb4f03288e14b6ad1de2a31dc44
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://arredamenticucinesiciliane.it/userfiles/files/36387558727.pdf In PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/lilozuge.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/81744200186.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/43422221138.pdfIn PDF document text
    • http://photo-poligrafic.ru/ckfinder/userfiles/files/99540898231.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/43599334336.pdfIn PDF document text
    • https://km2804.com/ckupload/files/28873438758.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/6421578261.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142652c80cf9---wagavowivadujowurevived.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/wejibofonuxafosuruz.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210908033202124736apet3d.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/35973341883.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/dewarizojer.pdfIn PDF document text
    • https://menu2uplus.com/images/file/32293281555.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/131c529dead081ceee8b922874163dee/tezitowolaporefema.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/14769916385.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314256412b7---kogujerawomevite.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/juludakaket.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/72154411721.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/regudesuzapumudutu.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/2rciao97ah9r08p9k91ocjpil1/susudoxavorox.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/rexuxupu.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///89455054827.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/nebud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=best+ps1+rom+sitePDF 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_off0000aec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC2 14676 bytes
SHA-256: 66024724dcc284f70b7edc617ffce1ee7f75f5a6a724ad55d34d8bac7ec448aa
font_01_sfnt_off0000d362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 10208 bytes
SHA-256: 2f8a23a54e82d3c9f08d9fccd6ec936655eaccb8729384939411121416463392