Malicious PDF — malware analysis report

Static analysis result for SHA-256 f181c319131cf01b…

MALICIOUS

PDF

96.2 KB Created: 2021-08-10 22:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 80abf0135a1d9bd519f96027343079cb SHA-1: c1a30600a51a84f3bf871e188940f45e1f3d1233 SHA-256: f181c319131cf01b2f28806dd45164ee96d6304846b00123864b45b112abc02a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://irlanc.ru/uplcv?utm_term=how+to+do+a+tarot+card+reading+on+yourself PDF link annotation
    • http://hakkabrothers.com/userfiles/file///losonutezodavufuvapif.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076e831d4c42---66916807734.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/kafolufixatazute.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/vdv5vbhcpjbm4ugp47mnd92obo/zalavipewolazobu.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081291072e3c---36522087632.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607064d3abdcd---rasaluv.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608581abb9c1b---pekizuvazizatupi.pdfIn PDF document text
    • https://petala.gr/userfiles/file/kepenezutik.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/32323165886.pdfIn PDF document text
    • http://ridendo.cz/files/file/35449491545.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/2189555042.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/2d7c4ac31209da27418d271b48824c3f/kazize.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/60267528587.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/lovefux.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/pabikevesobifefexowako.pdfIn PDF document text
    • http://liberty67.com/clients/41815/File/74899634857.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609625d9c4201---sijum.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a607057490d---14390608082.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/mujimidipaluvexepir.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/xevarax.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/73871318116.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/zajetoferojijam.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a918bd4a9a3---basaralebuf.pdfIn PDF document text
    • http://lex.tj/img/file/kewovikuxababorukirakizid.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0766badccd01d3d51b46c2139f22eb68/fedakejiloninopiwisafu.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/83027489837.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/gazagojexosiwejo.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_off00011362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11362 16712 bytes
SHA-256: c9f9baa07b40d272c57961ad1c46345652807f675cb88cf906e54df349f8d26c
font_01_sfnt_off00013e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E94 10940 bytes
SHA-256: 439ec197f4e198d4fb311fdbfad66630d58b909911e2d921c02f55f2c1db488a
font_02_sfnt_off000157e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1