Malicious PDF — malware analysis report

Static analysis result for SHA-256 7549229793a25c32…

MALICIOUS

PDF

84.8 KB Created: 2021-09-19 11:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0a04c2026e3a2dada61b3056f567acd7 SHA-1: 9b27b1e7f8937abb0ec956caa45536ab12fa5c79 SHA-256: 7549229793a25c32bb1c4fedf67205fecfd0bc6c3b85a9e4a20e15cf65182ea5
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics points towards the T1204.002 (Malicious Link) technique, and the nature of the file as a potential attachment suggests T1566.001 (Spearphishing Attachment).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://studiobonvino.com/userfiles/files/vonoxujediwekuponulix.pdf In PDF document text
    • http://leoclubmarsala.it/userfiles/files/40693692188.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/ligikasuzavuxek.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/duxotenugopi.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1239494d8---wuzefa.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/peu2vtk7pepi17d2lmh5r80t50/nalozovapinuwazekir.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/55335405908.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/maranelorubijobixekuj.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161361724b2265---20535619638.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631547160.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/jabikarugu.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/foduwufosoraketa.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/moputi.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/gafajuguja.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/sazarajubudubivogis.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/45055378813.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/zarabazenusi.pdfIn PDF document text
    • http://hongdacable.com/d/files/83815950401.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135ff803d002---71009996429.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/23472396758.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/13888677742.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/fupopesikev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=counter+critical+strike+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBA 20976 bytes
SHA-256: 053fb119674111e9877db88ab86a6908081105e94d06aecfb93d35bf227e6478
font_01_sfnt_off000114f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F0 10592 bytes
SHA-256: 166fa693c6b5e1cd475458aa63d361e788bdfe28f6c71c5ca16cf7e44964409e
font_02_sfnt_off00012d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1