Malicious PDF — malware analysis report

Static analysis result for SHA-256 a261f248042f61f2…

MALICIOUS

PDF

88.8 KB Created: 2021-06-25 15:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7747c4176285471fc8f45b2c1f79b4a4 SHA-1: 001acffcf429af4e7a7e41b9100b25f22035666e SHA-256: a261f248042f61f24dcb68f17cc317d9762431caf5896246dd329cac132f8fa9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic firings indicate the PDF is part of a link farm designed to redirect users to malicious content, and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the nature of the links and the PDF structure strongly suggest an attempt to exploit users through malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8103

Heuristics 5

  • 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
  • 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://drafthe.ru/uplcv?utm_term=astm+f963+11+free+download PDF link annotation
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/338c67d10d6ac0e0e7bc6d728cba4a9f/15755671723.pdfIn PDF document text
    • http://aps-mes.com/files/file/resarapewuloguvezazex.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fbda56d37---94103458648.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/sekokanusinenes.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/3fadef8685ab9b317baa541f4a4e1d36/kajelagejosud.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/183136218509eeab6793ec71d4164953/43419070726.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/tadawilanapogivem.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bc8ca14b6---mumixi.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/vomomosibevubipavel.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/204ca786bd7d5e5d1f2eee04b0e77457/gosusaxavaworopiv.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f19d8629e---14721432270.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/72324458848.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/pinezogelamanug.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a149bd4074---6053344272.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6564aa732---16138913073.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbdcbf253d---74347565113.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/84639047167.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608497ad1df6d.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b29eb84ee4---vofufexomuwesujudanit.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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