Malicious PDF — malware analysis report

Static analysis result for SHA-256 490240bd2515ff57…

MALICIOUS

PDF

77.0 KB Created: 2021-09-04 02:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6e8d44db37dc83804df1d28d5b7e7d66 SHA-1: d266cbc5d42aac6b78ede0393da65d889ff6d686 SHA-256: 490240bd2515ff57f883a731d3771b43180fdae8f7774f4f13e396c989dcd8e1
154 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URIs, many pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL targets suggest a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8353

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://drafthe.ru/uplcv?utm_term=siteground+manual+wordpress+transfer PDF link annotation
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/9485753977.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/63062433976.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/45878964727.pdfIn PDF document text
    • https://defi128.com/userfiles/files/nowadan.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/908293e9373da73c4f0daac554515f16/zibekolafasi.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/86500210116.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/9664936907.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/77688770919.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ac6569f07---dogajo.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/74482926473.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c093f909b7753a7bc9cbd9921b99b9b8/busudujepinivokawagekaket.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608588a556865---vafurebaremitaku.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03d5664ed3---luxilapogoxa.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb87f2ec40---fekitebolidalulugijejopim.pdfIn PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/64208579930.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/vosomazagojoguverunuzi.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/fekojigazabawagamokuvo.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/8b4315d1c8ab1496c6db0c46b0720d35/87341910749.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/25ec4cfc4cd66776ccb22233d973c6ea/12013753911.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16076cff858287---7373703583.pdfIn PDF document text
    • http://berbun.com/user_img/file/fekar.pdfIn PDF document text
    • 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_off0000f36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36E 17552 bytes
SHA-256: dac349dff8a3330a5b930dd040c302a2913ee99f1a97a48dcbaa136997a60220

Open this report in the interactive analyzer, or submit your own file for analysis.