Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5db9489be1d1a44…

MALICIOUS

PDF

83.4 KB Created: 2021-07-14 05:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8d8ab913260cefa6777e29dd20bce8f SHA-1: 255fe894e51ee0d25d49ab181228654405d87b82 SHA-256: b5db9489be1d1a44e21af49940a1bcef618a8074c106c7e3b5556840d1c622e6
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4647

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://krisoc.ru/uplcv?utm_term=negative+feedback+meaning PDF link annotation
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a370a1aeae4---48620421015.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16079d2bf85d62---xavojusironakivepaxepobe.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/b8c29ebece91889f506b19107f0946d4/9206017060.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05f2f8a20a---92811227494.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/38113616615.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/d07a00942c223da48b6db5a8a3b7dbdb/birajuwukifeteranajidifud.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/97b761cd57edfeed979d1f8f54429c39/buvelevekubegagumebuw.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/gagirefabirurefepolefe.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/pozusifikax.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/zisopubituzilo.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/luzorizavuxoko.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d88965be8a---40832245133.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/gefefufuxuda.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/sekurilojaxuratuv.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/4656396047.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/vowamewoxemedejago.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/33598cc8f4707a01c4af6047405a5d45/sadebiruvetakasifo.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/kosopuzis.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9c3cd0fb5---napoxopexawuj.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/61460026614.pdfIn PDF document text
    • http://pvvc.cz/files/44131612772.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/pinokemokevetonaxapod.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_off000112ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B01 10660 bytes
SHA-256: ae2ddf2a8e30e685dd9658e3b83b814b28bd4603233eefce42a9a39d5d92cdce

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