Malicious PDF — malware analysis report

Static analysis result for SHA-256 571572a1020a2efe…

MALICIOUS

PDF

83.6 KB Created: 2021-06-28 15:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 55a20d25154e3a4feeaed63befb3f61d SHA-1: 58ea78387734a69e101ad48ba63164334f890975 SHA-256: 571572a1020a2efe5e6d7d927061463abbf14d7ee794a3b818869a48392ce2c2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7299

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 http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52494290750.pdf In PDF document text
    • http://pagyesa.org/userfiles/file/20210625125428.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/24599075629.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/62250246022.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092406250af1---petaxukubedajivewufow.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/73295391830.pdfIn PDF document text
    • http://malachowiacy.pl/files/file/babopuxajarolazu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb250c0b3e---74258358316.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3e492f0af---76404018557.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1de2a0d463---15487142206.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e217ccd81d61b5240707cb977aec0d82/64693777692.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/kuriluxuduwifawexivopis.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/gutovubufipabojufakebako.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210616132200_5escgg.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608395b61cb19---lubezalobexamuwuzuni.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b94708e0750---delibiviwimazudegesunulu.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/momusipumetasobasiw.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078473c5faea---96729627690.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/xexalebixusujunukamu.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/fuzitire.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b77b316090f---juretaporuzute.pdfIn PDF document text
    • http://dzbnf.com/upload/file///48010432862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=section+492+criminal+codePDF link annotation
    • 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_off000109ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109ED 17340 bytes
SHA-256: 37fddc435106606f95dc1361200023832cac511aa62ef6f2c2db71d57e873f17
font_01_sfnt_off00013738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13738 10804 bytes
SHA-256: dc48db541e7c8584d2f2de0dca5607548ad969fc64f890d4e18b6394b91975ef

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