Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82d318dbecc24ac…

MALICIOUS

PDF

89.7 KB Created: 2021-08-15 07:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fb50ca9717ba13fa39a3fe3d7cc517fe SHA-1: 422568c82e35d9604b4769e9f445eb3fe3aafafb SHA-256: f82d318dbecc24ac8b875b42d7f5f56a218dcdf070f0ecb04c9c177726cb34d5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites and disposable domains, which in turn host other PDF files. The primary purpose appears to be redirecting users through a chain of links, likely leading to a phishing page or a malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=libro+de+matematicas+de+3+grado+telesecundaria+contestado PDF link annotation
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/romafe.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/zovewuribavabisefene.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/25631513481.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d093f36abb---41875176426.pdfIn PDF document text
    • http://charivne.info/images/file/goxakesepugamisaxeveku.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/kojur.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/fapo4poq576pncvku2vft4phl1/worub.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/migigokem.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16079d1cfbd9b1---64467061413.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845dc91ddc5---38453102874.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/kuvowo.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/wefujexuwoponuviganife.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abb33a0d3d7---2311993702.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/ea063e62ef17a98537ad90975f855bd2/lusefuro.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/94837722059.pdfIn PDF document text
    • http://landpas.pl/upload/file/tizegutikuvoxalidexewop.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/171249503560a6b33d56d05.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///58083954091.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8c9ee1e18d38bc9cdd633677fed52cd/pewivubujipubinixunu.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/921f0d8aa16e9a49fd9078016159a167/jatodokuvunajimiregutu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c8281cc93---88849059873.pdfIn PDF document text
    • http://nessium.net/userfiles/file/vugosixoforiferilebugog.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/gemenugemapuvibuzav.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080aceb87008---didubokenof.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_off0000f06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001087d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087D 21132 bytes
SHA-256: 08ab0e739d2823d727b81c8d4e32011ebed80df1251d6fdb6a82d2f4f127e629
font_02_sfnt_off00013cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBB 11080 bytes
SHA-256: fc6afc43cec196b2f34a037f585fc9a4be5b12ef705796d4baae45408cf162da

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