Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce87b945b95ddaf…

MALICIOUS

PDF

99.0 KB Created: 2021-06-30 02:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b72bc8c2950ec03044a4b06576096fcc SHA-1: c58fac32cd82557f1aa435ae82307bfdec08859d SHA-256: 4ce87b945b95ddafda9ce0bcc4c6ad3066eaa559858c308b8ab8486d5a6684b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous other PDFs hosted on compromised WordPress sites. This technique is commonly used to obscure the ultimate destination of malicious links and evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/45b2cad68271ecd876f6668966819a52/zugizufebebuluxevobo.pdf In PDF document text
    • http://akinmedikal.com/uploads/file/javono.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/rubobojibevegofasifivim.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/75582327476.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d964f7a42308c7b163c95859b7eeaf51/33395267316.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f9752fce6---94821313837.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/19032389519.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896b033f058---93228450735.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/pjtoj6op4jdoql8te3mhn97lj2/kebaxomopajalomumo.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/34328407142.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/fesanale.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a848a8b286f---70653481294.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d32050ba532---savasesinadilozam.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/e4b983a7d648d43521a7b04f9af61372/werapukawo.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9d77f46b535d29c615517ed4e0d52479/40940711920.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/texivilawuz.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/837b7e4e30894776bc3350637c31b7eb/dumiwen.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/98bfa483fbf153a522bd472134295355/xigiwozotore.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/8tevijlbdklg62mi56p52ejusj/zegidikaxilazuzuninamofo.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/linegowolexetukumidegojox.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/9ba1e89559b51591d25142a3cdb25a6e/jonowesataxudazonotemelo.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/wixuvipewunej.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/dajaritoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+pacific+gomoviesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E58 18032 bytes
SHA-256: ba97badbf12f11534c9bb2a461a6d3257ba6e87370c9398bc8c52a2ae081107c
font_01_sfnt_off00013d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3C 4644 bytes
SHA-256: a71509607a345df0d9751191a5496bada5008749fd6801af18ef73af7ec53cb6
font_02_sfnt_off00014e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16663 10608 bytes
SHA-256: 97313b23986aa368cf795ffa1cfbce18f31b8aa3abfb43c1fada021d324250af

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