Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8dfc054415bc947…

MALICIOUS

PDF

83.2 KB Created: 2021-09-21 20:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf8a247e58935e816c116ff64c4f6f23 SHA-1: 593fe20d6dbde8b65fd3217b0bc234e190fc8de8 SHA-256: d8dfc054415bc947b8c1dbeb60211260d40904de5c10405fcd44958de9711a91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.stnedu.com/ckfinder/upload/files/99185876984.pdf In PDF document text
    • https://drhuanghair.com/uploads/files/202109041657317627.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210921_5CF32EF9AC43BA86.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/totod.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/32236480744.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/677e64fec11c529b9abe7a42a16e3b12/kosexunenoketabepunibixu.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/14977299506.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/mirunowobufetagiputulol.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/xujaborafe.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/tobowofatudufimowadawulup.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613557777c6f9---5477502474.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/laxikasibegubetewegakis.pdfIn PDF document text
    • https://thehouseproduction.net/file/rugunove.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///bikigovafe.pdfIn PDF document text
    • https://krusomying.com/data/file/pisiw.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/24194498817.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tosogovuzokojaliva.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/runajes.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/160ec1a69ad9f9f7451a43de14f9be65/sizutefamurufilijeze.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/12668231241.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/18221610398.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130524fe7c39---wazaliruranexeruliwi.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/zusurefe.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/burelazenanowatogi.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/67607885631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=descargar+bendy+and+the+ink+machine+apkPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/zipupabovijivefiginit.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_off0000defa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 11140 bytes
SHA-256: eb0d372866017151ecbdcccf70d380481b94c06e8158512414f1d25bb19f163c
font_02_sfnt_off0001108e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108E 17916 bytes
SHA-256: 6e1c8431abdfba402205fb53e94729d4e6053292548adb56294a0fb25e3f9484

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