Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8dc522bd79d9396…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 01:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 23322be060b86a1320f3839cd52d27d1 SHA-1: 07f32acabfcc938da188b00e34a2f24da6e76a78 SHA-256: b8dc522bd79d9396f16d98f22aceaed7bbfa66302949252a2cd449a28d23adef
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised WordPress sites or disposable domains, forming a link farm. The embedded JavaScript likely facilitates the redirection to these external sites, which are probably used for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://synerhu.ru/uplcv?utm_term=aune+x7s+manual PDF link annotation
    • https://juegosinflablesarizona.com/files/kofurure.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/pofosigurerugu.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/negivamusak.pdfIn PDF document text
    • https://fivetc.net/uploads/files/tikaxuxosufigoj.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bb2e1346d---zobufufa.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/94999001194.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b997dc21237---2319737456.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090f6df78356---2094887894.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/3177d6c44a9818f1e2590c4e1ce7bcad/12668125048.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/80cqjcjr6u7inj21tvoap5bjoj/japadimawunu.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210630070349469.pdfIn PDF document text
    • http://sbcnepal.com/images/file/5400906532.pdfIn PDF document text
    • http://azizolace.cz/images/file/dibitibu.pdfIn PDF document text
    • http://laduses.nl/image/file/57163521644.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/15927706912.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd03d972d06---nofetav.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/88326346282.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/79628d5d27b81e2de80431cbfad84891/94169354157.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/40555254073.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/wewaze.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/52563193855.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/6a73bd13c08322156edc7babab4a4527/juwiwux.pdfIn PDF document text
    • https://lapakunited.com/contents//files/doginonevebunowomer.pdfIn PDF document text
    • https://retta-bg.com/userfiles/81348479311.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/fuvadeloribixeguxizuga.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/55386149500.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/negutorat.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_off0000d910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 18812 bytes
SHA-256: d35114e90b24d595c1fc952512acefae3a73397fa5a321e0a48749612a68470a
font_02_sfnt_off0001228d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228D 10092 bytes
SHA-256: fba2cdc6cc83d1e1f1f301ebdaee0992a5dee2ff7f5903c746bc7648729f6a11

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