Malicious PDF — malware analysis report

Static analysis result for SHA-256 107b340eb2a9e629…

MALICIOUS

PDF

81.8 KB Created: 2021-08-30 10:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1353689c8e913cb9e353a639fa744a2c SHA-1: ec985836a60277003b081d2b824068748de80c86 SHA-256: 107b340eb2a9e6290e1598a91882436e97388c60825b993517a4a1e1bdd29efb
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to websites utilizing compromised CMS upload storage, indicating a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The primary attack pattern involves luring users to external sites via embedded links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3253

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 http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16111ee60330be---jesatiregurizagupovuro.pdf In PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/mirugisex.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1628934344.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/temomidoxiko.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/68473913731.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/gemame.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/pipememetodogetarezugefis.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/xowolasofiduwukalizibax.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/6658234bf3551edd7e1c5a7c3f1ba7db/pefakojozigetoxogerofa.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/n318i8bnad99stpguct2e30ubf/1576995118.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/12279785627.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/26845135897.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/53456eb569281c9e1e02326c714d69d6/madazukixawu.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/13346341383.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/nofapuxezaj.pdfIn PDF document text
    • https://fasleh.net/Files/files/wakijuwajeregotewitivem.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/fefojavidanaxudanine.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/38569520290.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/muzidimikolomapel.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/1d01b3c45b2af7d11ce53b7f5372b6e4/jugisebobebawunejug.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087debf3d5d9---zebejitenexaxapezujusupun.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/gigan.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160849d8592b48---76983034623.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e04c922dfe---wepezezabaleloled.pdfIn PDF document text
    • https://papiratisk.cz/soubory/minisaxavuniki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mhw+the+greatest+jagrasPDF 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_off0000fb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB71 19672 bytes
SHA-256: 6a13bff38900393d67ddef2d6648853585478db3be572093a19002500e3ce218
font_01_sfnt_off00012f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1C 10236 bytes
SHA-256: 72caf1b1bcd9f65cfe28d989745e1d49d71a6ee600be01ddd875d19a104af213