Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8183666b54ce211…

MALICIOUS

PDF

85.6 KB Created: 2021-09-15 21:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3965c20f5ee100f468c900b1ebb05176 SHA-1: 200e4b950fe00a4814f8beb4db2a53b80a66f58a SHA-256: a8183666b54ce21171a716764507e02100dba58160d19ee40cc2de699da526f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple disposable hosting sites, some of which are compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish users. The embedded JavaScript is likely responsible for initiating the download or redirect process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://ratodua.com/contents/files/14414459690.pdf In PDF document text
    • http://centromp.it/userfiles/files/betotimonewilufumoze.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/52397533459.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b3914111d1ce4f842dc39ef1b74b93c5/fenosofimaresujugewapi.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/oqi7hk295a5oqpec54vqbinvfa/kefifukexiva.pdfIn PDF document text
    • http://www.moyekolodin.com/files/44014235763.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/pibolajuba.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372198dd3cb---51881594167.pdfIn PDF document text
    • http://partnercable.hu/files/viwozuresakagebivowuji.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/48594996085.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/gidekuwerofodoroturiluror.pdfIn PDF document text
    • https://paperland.bg/uploads/file/56284872293.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/liderise.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/dagezodimujuzizobopelipik.pdfIn PDF document text
    • https://trieurodata.ro/images/file/73484746708.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/posugo.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/26692729747.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/naponanuk.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/2891267967.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132c73a6ef1c---450168156.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/13283956442.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/welalidusefu.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/95243782593.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/38351127446.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/bevikogowoximekakorofen.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///nijojufidum.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/manarisewute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=download+free+popcorn+time+for+androidPDF 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_off0000e8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10103 10700 bytes
SHA-256: c17c1ec0b8c55a3fe82fb9d75c2fd66205f87da6a966b7e761c2d03434c7bd97
font_02_sfnt_off0001198b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198B 17992 bytes
SHA-256: 283c48dd02ba128d68fc1d14bc3a914e81c389b235bb76d1af03f476c0d18efa

Open this report in the interactive analyzer, or submit your own file for analysis.