Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4e960fd0f06cfb…

MALICIOUS

PDF

76.9 KB Created: 2021-09-03 04:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 523d9525ea4657d701e6eb16144940fa SHA-1: 1bcafcefb09d37938d4e82c2f7972e62344f06cd SHA-256: 4f4e960fd0f06cfb51621e96a79c4d07e4ba8416d8bd6a8896be5ea911d52cf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The presence of these links suggests an attempt to lure users to malicious websites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://cheers-gifts.com/userfiles/sojebiwogu.pdf In PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/60185255185.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/3108721e3f34577b25667ce734c36a76/rogupikosubewoxene.pdfIn PDF document text
    • http://konberdbio.com/upload/files/48267982626.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/2d469f4c590a0391ed6e1550acbb66e1/bedepoji.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1094a8119fa190f38ec2140d39285e25/72549992915.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc3bc510ce---9156860133.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/48952799392.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/72562611840.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/43204068777.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37156756732.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612719095c920---75375140064.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/8220724630.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071454c3a49a---nojukexe.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/edea583719125c0062591c8bd2c1f3f5/44633241926.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/f2b5f98886420371a3a72fc56998507f/pedepuwebuvotipokozeb.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/turubidogoguxisiledez.pdfIn PDF document text
    • http://www.77ice.com/upload/files/bewasatizenovoviwez.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3e69472ce---buvosidaxe.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/61ed4fbc21da303a6abb64948bfdf020/kabuki.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/gajebo.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/pakuxumilubefos.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/95460163316.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/21045208386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hang+out+starter+workbook+pdfPDF 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_off0000c2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC6 10944 bytes
SHA-256: 06334d97515ed3989c594dca7db4260e0e8b5039c81fcc2cb62675219ab7fd10
font_02_sfnt_off0000f3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 19640 bytes
SHA-256: bccf5ab47be021f5e721213853c5231b3b4272b0f2565ec17f7ede5664cc1e57

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