Malicious PDF — malware analysis report

Static analysis result for SHA-256 506a9289f97fb95f…

MALICIOUS

PDF

92.9 KB Created: 2021-09-08 10:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 51a51390d8c6a499ebb37cc358b6a1b4 SHA-1: d619afbefd1a9f57042070cc1745c7d86477b594 SHA-256: 506a9289f97fb95f8a7f2b0eedf9202d3d9ca1c9b37234e5fa1ae88dfec75d31
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or trojan distribution attempt. The presence of embedded URLs and the nature of the heuristics point towards a malicious document, likely delivered via spearphishing, aiming to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2680

Heuristics 5

  • 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
  • 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://pistant.ru/uplcv?utm_term=teaching+demonstration+evaluation+form+pdf PDF link annotation
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/r8bq37ae5efjp4upsl1o3fb06j/nekavedibigob.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d4745f909ec9de5758b73ad180717b65/79768498221.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/54135655526.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-8-16/20210816121053871975.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0409688001624913186.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841d0fb5e4f---tajunoweziwudugenatime.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210807232707.pdfIn PDF document text
    • https://parkettworld.com/upload/files/74709413492.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/40809089729.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/51648041922.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/18251514951.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/67c1f585b8c78c608a4463bc41407306/69003014303.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/pudimazefutezad.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085261adb6f9---87194637224.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/74183961202.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160744194ee19a---bakemodekafakorom.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/20219864240.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d98f113090---50771641611.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/tolobep.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe19a01bd73---70618542992.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16114f34a1abfd---16046158935.pdfIn PDF document text
    • http://contextuae.com/resimler/files/jivexibapaja.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/wifazejezox.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/gibuwo.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F51 18200 bytes
SHA-256: daf6f48dee11daaa4d9be5b0129e57b506621cfeaf436d597c96763a0f878908
font_01_sfnt_off00014ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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