Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ba2bf295b73469…

MALICIOUS

PDF

100.6 KB Created: 2021-07-07 12:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 82ad6c345204e4223d678a97fd5ee5e8 SHA-1: 0a5f01cabedacfe0ed5769adae2a9e97debe3142 SHA-256: d5ba2bf295b73469bbfb0fdcbaf6ead98fb522cd64edff90abdd20fe05b2fbfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9682

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://infrive.ru/uplcv?utm_term=one+piece+episode+1+tagalog PDF link annotation
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/kikuwoxubufufafawazowuzu.pdfIn PDF document text
    • https://best-label.com/upload/files/galenex.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/27745792353.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071a5baf1113---wotekawawedokazilak.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/mevalizaroziluzonewiw.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160929ac253e28---32844173063.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/44737759597.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3bc049038---10528968548.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/84ac2239443393c63af0259526eacb44/zuxuribebuv.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/60374168358.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/2769585fbb6772a7c1ff9bd7e2da7c01/xitowufitisomaravifeb.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/80180183283.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/23b4f677ce4d7bce67303b665ad4f35a/fupavuxo.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0342c79bc---54956419463.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7872a8b006---4655391972.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ifh5ekgdomnm533cupkfgsf4aj/regunadosudavawajavifa.pdfIn PDF document text
    • http://amandamaitland.com/images/file/41005384935.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/31fue70llcbntr85n7ha8pedjp/87442626567.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/47a2ffd327dcd28b8200c590c8ee4902/wuravenapepemonopa.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/72770994579.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/gonajazi.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/69976737023.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/65805134585.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/3179c1518f24c6ebbecfaaa0978c81b2/76047720997.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160841f53454db---bilonolek.pdfIn PDF document text
    • http://balone.net/_upload/file///31252747545.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C57 18104 bytes
SHA-256: ca41f0e76e348625ff7455673864cafd112d42bab772fd10a552e2e5b1441adc
font_01_sfnt_off00013c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C51 16724 bytes
SHA-256: e334615b0d37073656754fc4ef2ddd6d7f5c405430b2d653ebf7df5cc79635dc
font_02_sfnt_off000153f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C0A 10668 bytes
SHA-256: 170d217174a0ed86ae20d25db8e4ad51706b517e57efc0524cb7d7c5f473f4f2

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