Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b737e03184b91a…

MALICIOUS

PDF

64.2 KB Created: 2021-09-13 12:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e92e44eb3f33fcdecef26c33f8668c15 SHA-1: 734e418f9f189c7ca865fdaf4bc1b19101ca1924 SHA-256: 15b737e03184b91a84d661a0841941816d836a3af5a18b6318ad507006a66a13
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS upload storage and disposable hosting, characteristic of a link farm used to distribute malicious content. The presence of these links suggests an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6960

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://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161303875531ae---wifaxatap.pdf In PDF document text
    • http://abwfinlay.com/uploads/files/29030343255.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/94045973503.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163046639090.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/joduvalaxatu.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/digojugavojimenelej.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/inocie3smg3srnakgvi74mabdp/18248301433.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/88623499272.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/7643419816.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/2233559614.pdfIn PDF document text
    • http://centronegozi.com/public/zujefajudobofakorow.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c29b585a23---mivawaxuv.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e984f34746---54903366907.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/bixudabufuporu.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/e5504cbc326580b3cfe2b0e14d138e9a/bezuxasoj.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/78017356960.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/xoranasoxegipo.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/71828723279.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/96323197386.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/zusamege.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090602512420.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/4227326671.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/jazanusulakobina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=forest+tree+housePDF link annotation
    • 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_off0000da60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA60 9880 bytes
SHA-256: ea4f5fbd081847054e7c3775b4d196f3025c413945365b225f22a7178732c9f7

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