Malicious PDF — malware analysis report

Static analysis result for SHA-256 7931bb52c1d3425b…

MALICIOUS

PDF

70.7 KB Created: 2021-07-01 22:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 529bd1ab4fc8edd445862b546d2ab9ce SHA-1: d4bbd21176e8deb502bf37ea3854038ea26f29a4 SHA-256: 7931bb52c1d3425b57ff3898d489fee20ac76deae44904cedd67c183a65e7fa0
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, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially untrusted hosting. The primary purpose appears to be directing users to external malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7822

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://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a5287341a---38123735077.pdf In PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/kixalagigawapafeforodu.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c2997f93b39---43485072185.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1242b7d16---lofisuwibibaze.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e61893f897---10240514190.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/raxususanuzironedewapa.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/932ed7928a51f259953270f14569c1d3/bubekofixup.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/87ahd6dvlv73e9th5m4l5dv0f4/gefavilifo.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/67502351913.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/aca62ce6109a0061ff43193b7649ad87/36928817400.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca468da4710---56877785179.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08f199dfbc---kikelumabi.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38320bb8d5---20262596636.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764e37659b7---lozigopubomawaxonasususi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608701f0a3727---49267544447.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607e46c2316e7---69055196400.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf5a3a7111---89074769899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=3d+horse+anatomy+software+free+download+for+pcPDF link annotation
    • 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_off0000c3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF1 11068 bytes
SHA-256: e47e50ab72381646d6f0294c904a4e838cc6292b70ef18c1e771cdebc313519a
font_02_sfnt_off0000f5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A5 16688 bytes
SHA-256: f071631951055e701683a9fb5b5f6490cf4e2cb892193d4af865d6820200b893

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