Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0989c69db69ab8…

MALICIOUS

PDF

87.3 KB Created: 2021-09-04 02:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 73b3d22701a77b5425e3342891e3237a SHA-1: 3d0c2a61cfc9d93f3523f22529d073116adbd256 SHA-256: 4e0989c69db69ab88bd2978a48a9493f8efffdb386601fbae4e69bba3d46b1bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=napoleon+iii+and+the+rebuilding+of+paris+pdf PDF link annotation
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a02af52dd2f---96773265074.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210825185114.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/16239427066.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d2c20c3c9---sogenupipenevibibamuzeze.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/ae08fb7dc1cbd64071baa1510b8472d2/11225584236.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/49344d3ee580737ae9f59c81030cbc19/pokajuvusuwerevogox.pdfIn PDF document text
    • http://atomleasing.ru/media/File/73448994780.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/lunerarifimuxumezavafuxuk.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210811_195606.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/f6d92e0bcfb2f4afef00ffa480e734b2/juxazibose.pdfIn PDF document text
    • https://bio86.net/fichiers/gevorofegime.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/vrsmhpi13ev5h2vvnn170dllb5/3499524772.pdfIn PDF document text
    • http://fittbike.hu/files/file/temoxiful.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/43778521000.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/7720803793.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc96936564---25404639968.pdfIn PDF document text
    • https://hirurgija.me//files/60853359016.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/26642592260.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33498994404.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/68886947064.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/kasabovamorise.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/1888f7e959f76db4d8f2d69d6768021b/55317865464.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/70984a9439320dc13f0cf03272ffa2e0/9029666243.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_off0000ecbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 10992 bytes
SHA-256: 2c175d4bfda752343dbee7a74385ec612bc0205f452def70a2116555424d3940
font_01_sfnt_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 19076 bytes
SHA-256: 4ac236b3d21c5a52e36271ace5786a41153611afc1190a84734b2a78ca1cfd06
font_02_sfnt_off0001375d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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