Malicious PDF — malware analysis report

Static analysis result for SHA-256 1261cbe54ea0c549…

MALICIOUS

PDF

69.8 KB Created: 2021-09-01 10:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a03afe1fe9f3e53f2c9179d7a795c1d1 SHA-1: 285e36b02ae33ebcfbf2c9ae1fb4ae7bf96377f9 SHA-256: 1261cbe54ea0c549a60d450e02f23ad207ac75cf748fb7b4c5031ce8c70ae5f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories 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 0.9965

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://maslag.eu/userfiles/file/tizupu.pdf In PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa3b58df4---navewopoxuke.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/63627253731.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/78259428057.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/59684277671.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f1cff414a6e---zozuleguzevakaz.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/bonefovulanono.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/54439022609.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/10497327318.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/80821892463.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cab0104515f---texid.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/71193445565.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/4949961457.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/wedemevoluwivomop.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/pilifegufanafuwus.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cec70f875---winuxokilawuxuxunaxuwob.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/rumoroke.pdfIn PDF document text
    • https://tl-systems.hu/files/files/xibawajimotelefusowugemun.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f10852e012---turobiwenizuvobu.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/mudunobotedu.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/75133002812.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/eb74c7ba29067df0e8a3142ec261955a/11706721258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=prentice+hall+brief+review+physics+the+physical+setting+2020+answer+keyPDF 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_off0000b194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB194 11380 bytes
SHA-256: 7bef2d029469962fae81cb3c9e04e05fc065dd209658f57ab23e753406375f01
font_01_sfnt_off0000cc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC46 14676 bytes
SHA-256: 1d06e09dc1c07b5227f933871502f8f5949bd53f97b8a40aa91be58a458540a9
font_02_sfnt_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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