Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e31f10508094deb…

MALICIOUS

PDF

77.4 KB Created: 2021-09-07 07:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 431552b23619824c2a0291c58e0e5baf SHA-1: 5557b501a89ebaf5ec09a10b9f63da1587651656 SHA-256: 2e31f10508094deb7b0f79fd6de95745d493bf8a6d84eb1b0174e11c17c07500
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are on disposable hosting and likely used for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://synerhu.ru/uplcv?utm_term=fifa+world+cup+2018+schedule+qatar+time+pdf PDF link annotation
    • https://sardavetri.it/userfiles/file/59122035067.pdfIn PDF document text
    • https://soechi.net/userfiles/file/91896203731.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/23525738143.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad5ee38aef---bedanazimimafomamepaf.pdfIn PDF document text
    • https://drlanda.hu/user/file/lusarinuxiganarane.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9890a9680---32926036972.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/7132953127.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/99771449348.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607786c1cb0d4---gutajozatu.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/9113039271.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/d2pmncsq99an5u3000kho4up03/suxonugibuparekunexewi.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/10530450693.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/7140470554.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/020009152685.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/fomafokodamorazezeko.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/govog.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18007685874.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f6a7e413c5b5ba32943d650cf08d2949/lujowuvetipujimerorazewe.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/74818c31d628c606b11346883cdf4d6e/53394935683.pdfIn PDF document text
    • https://scriptdd.com/_file/file/57308705879.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/11000226918.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/29767014855.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210625181806.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_off0000c5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B2 11592 bytes
SHA-256: cecc9483cc88d366631a3f02d8b828e5de0003b0a90d386b1afc031a04d3f6b5
font_01_sfnt_off0000e123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE123 17644 bytes
SHA-256: 98f3ed77dd746f60ce42f92ceef5d9e812f082b6df8c0b0c98d28e1533f160b1
font_02_sfnt_off00010df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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