Malicious PDF — malware analysis report

Static analysis result for SHA-256 df931af61253e57d…

MALICIOUS

PDF

81.6 KB Created: 2021-09-11 03:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8569a92b17a4b9aa8d72933570d06049 SHA-1: 0159e8ef657b537ac573c89ceedb7bc21135eeaf SHA-256: df931af61253e57d6a9e64384eec1ed2063b2fc2f19e5881f17a945f4b25bb7c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or exploit vulnerabilities. The presence of numerous external URIs, many pointing to compromised WordPress sites and disposable hosting, strongly suggests a link farm or phishing campaign. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or malware distribution lure.

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 https://synerhu.ru/uplcv?utm_term=how+to+mass+uninstall+apps+on+android PDF link annotation
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306a8805481---fojidijobojususujinebi.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109100145425934.pdfIn PDF document text
    • https://rippa.pt/files/file/jipepezekekuzolarumituwum.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/gudesopeget.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/nogozumak.pdfIn PDF document text
    • http://juha.be/_files/file/sogoputorazubigugu.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/868dfb99b47524c6efcdc724d0aaeaa3/natisovetomamukegepu.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/96440750082.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/vuxifavorebuzukelufinu.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/xezovaremo.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/72727359237.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/kozevosebuzoduni.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/tixapanijeb.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/muvikoboj.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/87906534360.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/17883202276.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/xagogi.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/dewimegitot.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/saxolufenerusuxowajuwulu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319f1cdbca2---40277012134.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a9f1c4b1e---58461420693.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-6/20210906060618502808.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_off0000da75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA75 18112 bytes
SHA-256: 22cc60762e7077db4cd86f47fb4271a7ad26201b7d77c616f42aaa003f41e831
font_01_sfnt_off000108dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 10600 bytes
SHA-256: 0b12cc58b2d19e677c5ea88380560fde83ddd93cec588825c27db93640b6e4c8

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