Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d8298914570423…

MALICIOUS

PDF

73.4 KB Created: 2021-10-20 13:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 064213fec9847d976fa6297e2f26e297 SHA-1: e61f880e20d04e0f37df23b1310a304bc22aeb56 SHA-256: 49d829891457042352faf063ce1d288b4b7d4e3c7d51642457e6cdf5ba55e4cc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF was flagged by ML and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to PDF files hosted on various websites, some of which appear to be compromised CMS uploads. This suggests the document is designed to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6630

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://1qjd.com/upload/files/2021-10-03-04-46-07-XR6bnRQl.pdf In PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/55381786622.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/musolibojirowutoma.pdfIn PDF document text
    • http://a-pluset.com/userfiles/68233123928.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/sizenusekukuma.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/10003484417.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/41041715319.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/5dc3d8d7cc369fa223f4d717cadfe2c7/84771292820.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/14435685526.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/40599273633.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/22770659.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/45770456367.pdfIn PDF document text
    • https://nusantarabet4d2.com/contents/files/12048417124.pdfIn PDF document text
    • https://luminex.pl/upload/file/77312907404.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/57963583372.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/m3092778fos9jfafqcsjl7dlr5/gunadoweselaxoduvag.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/41559670121.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/85291385354.pdfIn PDF document text
    • http://sireny.net/share/files/79134898228.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/49126110934.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/wekeximobepute.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/10330080285.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9d58d26a5---62984873700.pdfIn PDF document text
    • http://glassick.com/userfiles/file/wipisoji.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/36613867796.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/BGAemAmcdTc/uplcv?utm_term=if+you+lose+your+permitPDF 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_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 19008 bytes
SHA-256: 2d8b60a407b5e67541ac1ade6b178bb686816fb0f0cdb18bb8b7381ce5bc11b6

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