Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e31b6d354cae44f…

MALICIOUS

PDF

86.2 KB Created: 2021-09-09 10:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 132c8ac5ef9fe177a90ea9e0cc866e15 SHA-1: 6c66d2ec2873ddc22b02283c5ca39edbbe4f8f63 SHA-256: 7e31b6d354cae44f19fdc5055354f069583d09f4c898dbb4f19911b775985316
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple compromised websites hosted on disposable domains. These factors, combined with ClamAV detection and ML classification, strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://ehomerealestate.org/images/file/voxugegegetalof.pdf In PDF document text
    • http://picassogift.com/Uploadfiles/files/xesoperepixukorixene.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2692306357a465412726dcdff73c8fdd/mixobamajuregasujedetaku.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/ximujadow.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395128892aa---mapisebog.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136c73bd9095---rudegubikefemoresole.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136efc83a0b2---6356201615.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/19040362888.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/zulivowadomigobesagap.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/nasugolowux.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/78510367385.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/vagikevuneronajigisaja.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/49746471897.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/4490661832.pdfIn PDF document text
    • http://kgmda.com/upload/files/10098520383.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbe4a0c62f---71232297001.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/62364951953.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/woviraf.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/40458648229.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/96735864306.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/23006550073.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/33445932269.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/kuniwatosazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+magic+finger+roald+dahl+pdf+downloadPDF 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_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 18392 bytes
SHA-256: c3554e39919c8c28a97be983de750cc0c2b2ff1325f2a587dd9e7afbbd73131d
font_01_sfnt_off00011a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001328e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328E 10852 bytes
SHA-256: 9f8976aca032262a8331b09ae79857f663bd5bc1c0664ff6775025d932c0af09