Malicious PDF — malware analysis report

Static analysis result for SHA-256 60d1b9c5bff74ad3…

MALICIOUS

PDF

70.8 KB Created: 2021-08-27 21:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e2dc12c63a390f4823b12d6cef2d6771 SHA-1: 9d45be9e76b927799c0e17a0f497d8f4da51710f SHA-256: 60d1b9c5bff74ad3ba96276bef89d44ff0fce6c83271728832d0dea119123985
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5455

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://digireg.cz/upload/varoz.pdf In PDF document text
    • http://cedarvalekansas.com/clients/875954/File/38509943357.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/94fa2bf60e747422a81dfe38469144da/77368626015.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/laxetibirifesikok.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16116f32e6ca1a---53854933565.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/rrm69dbci3hqdqgpfhu8udkogq/retobuwudonesutavukorutu.pdfIn PDF document text
    • http://sfera-vlad.ru/img/file/topikureju.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/pk50p7op0k4ak24p2v4jlk1605/damufafifidal.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/1d72121d0b5bef4b000e540fa94a6446/76320611197.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/11943727003.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/xezolejejovijetanefudovi.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606faad722857---46563754127.pdfIn PDF document text
    • https://andrejc.si/files/file/nevuxomili.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/89829414719.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808aa49b746---lusipabexelam.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/aa728af555c13871f5386be9a3a9e75c/67363313110.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/32724079963.pdfIn PDF document text
    • https://harom.ro/files/file/65387297592.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88f6976f28---48364217219.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/5amqirfdpbr91p2nlu9rc8t0jm/5217821581.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/47991599818.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610e0837667b0---pixobufogeviwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=great+carry+out+near+mePDF 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_off0000cf37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF37 18868 bytes
SHA-256: ec3779db86d35371d15583f3b1b185652e5c9e084d78270f425e197876f098f5
font_01_sfnt_off00010006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10006 10336 bytes
SHA-256: 1450ee0cb28a3d60b09c1a0e23bf93920e535fecbc8085ca6399724208b22ca1

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