Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9fd5b57cf3232e…

MALICIOUS

PDF

87.8 KB Created: 2021-06-27 19:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: de0d9a66b4fcbb932ff9af57e9507f10 SHA-1: e762a5dc1b52a230ae22948aab8b915b7f595508 SHA-256: 2b9fd5b57cf3232edbdd9daef673700b44bac2abe01b2607f33a19209e18e0e8
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress installations, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=rehabilitation+and+retrofitting+of+structures PDF link annotation
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/5ed5a063aa0804d6e2b584f69a7ae295/vosipoxagodidojunow.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd688a7861---lefexovaxotinezuneri.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3a700720e---gajuvikaweviza.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/mofovomus.pdfIn PDF document text
    • http://abnicum.com/files/file/vewepamaboxofufoxukorixe.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/65126097867.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608857b5c21cb---52252234464.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba65dd37d3c---ninubajozumez.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ea0d48a31---dazovapa.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/53213857301.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/t9esth1dr093d320s10044st56/sapopeviritakekuw.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/mafivezidetutepifijes.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d4281eb653e---73789422445.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/h77nirn3o2v1f68hsbkcqg7q2l/lumagesidelofujulaza.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/46312772452.pdfIn PDF document text
    • https://isleo.com/i_photos/file/78569200889.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b036d786db3---rewosuluvujelogatogen.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/zelaxamevugepepanaxol.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/vuzevo.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa3252e380---zufanowesagopomomibixex.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082d1407396e---19598104709.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/wujetatiruwijotitepujakex.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/7408fe8a17d900ade35656fd49829255/67700526311.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcd20dcb19---2870609848.pdfIn PDF document text
    • http://roocenter.ru/upload/file/43472363884.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_off0000f4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 11040 bytes
SHA-256: bdb55e7eff8fbbce0a7adefa429742d470d55b8af154df93a2ea316fd1cd2de9
font_01_sfnt_off00010e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1F 16660 bytes
SHA-256: c90e9afe17e6774e4a9524c182e91cb6fe1578097ff3ecd13d53dfaaa91403a9
font_02_sfnt_off00013993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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