Malicious PDF — malware analysis report

Static analysis result for SHA-256 5234760615116a63…

MALICIOUS

PDF

79.0 KB Created: 2021-07-01 17:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3389eae333638dd878a443b7e45c7201 SHA-1: effa77c8b86876e43e9cbc73694aa9fcfe20756f SHA-256: 5234760615116a6337dec2f47e5ddbb87c0086155a41d8fc3de2547cf50b6c48
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories and disposable domains, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7191

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://coretry.ru/uplcv?utm_term=completed+gba+pokemon+rom+hacks PDF link annotation
    • http://acmemask.com/upfiles/editor/files/95091852054.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/49892169767.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4cf80163157fd2deb97f6f4a5e2b04c8/batipube.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61a5423fc7---dalafijisulevajovawobad.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210603173257.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e4bd6c55974c80238c8b80d00c121c8a/84406568429.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/61120ae9661174c5e9e9536a1db8aefc/88634775087.pdfIn PDF document text
    • https://ttnthailand.com/upload/userfile/files/mitazapogukipem.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4578f135ae809ff8e366a3f32b175af7/fabopujiwatowinuwaxes.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/423ca8abb92b7637e7de81a7d03d8042/87396056945.pdfIn PDF document text
    • https://digireg.cz/upload/dipopinuziwezetejevonilaf.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/47f9362f99942fcf22ccb704ccdd3780/gagalunib.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1624142560gabona.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/rigowavogari.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e0005c847---90606458466.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/2f7s3g83c0h7ipjm6fdv9mso0u/91294202087.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607dab3fb8400---71059247955.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/84492476555.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b1721c7b174---58864656731.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086ff1d1e12a---lobowu.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/f6n06d1hvcg1js9anetlgo2mim/wupad.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/58kr0dmav8aq2odqk8h1qe4cv9/10689972674.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_off0001023f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 11132 bytes
SHA-256: b5957d131a996d5f5dc4e2f540f158a1218658be5a759cc9ef2faa9155394ecf

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