Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f692875621e3c5…

MALICIOUS

PDF

86.5 KB Created: 2021-07-07 22:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 21add782750ad1132d7eaad2fd717388 SHA-1: f2b28e627dd7b2e35d8c556d19c6d75c9f4a4c54 SHA-256: 43f692875621e3c555adb65590b77ad3e2862da477f638bb6d0724f598ff028e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to initiate malicious actions. The sample also features a link farm pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to malicious sites. ClamAV and ML classifiers confirm the malicious nature of the file.

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 https://drafthe.ru/uplcv?utm_term=the+blueprint+download PDF link annotation
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735731e918f---rofaritudugikubaxuxope.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/70918145387.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/96798693033.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/498469c1e475fa9f3ff1078f5cf06d12/77264521591.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a17f4c3d157309b44659753d0470a7c2/vuxutemijemogixaruxus.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/fv4aqgcv9f8hvjfi2futuhs9k2/25217323344.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052922455219.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/a9lkspq8kputq5554untm1qfd4/13553216035.pdfIn PDF document text
    • https://susta.vn/userfiles/file/22151083356.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076de8a44206---liwosuxakevefi.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/xexiropunazenarofekoxi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b5d3a174a---18104494845.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070e861311df---likivavetinojirak.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/gexerozowopopumugifovu.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/17065745238.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/2805608350.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/babapow.pdfIn PDF document text
    • http://axwelindia.com/uploads/tafisafifudotojapizurev.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/porudibunukidis.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/fcc8399785f1654fc8d3c29abd2652f3/matixomipufomoselovowajev.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/wolewavowotos.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/zugumigexaforel.pdfIn PDF document text
    • http://communeouchamps.fr/userfiles/file/womolodazazonufum.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_off0000eeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FC 17456 bytes
SHA-256: e74f46c68ec0233a37aab87a68cdd8ea3920b5f3598a934f9aea54f6c93e6889
font_02_sfnt_off00013518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13518 10608 bytes
SHA-256: e201f04cc3764c282ae49e9f8324db7f401fef4daca3074b09279c8a7086be5a