Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7baaeb618a9aec…

MALICIOUS

PDF

72.1 KB Created: 2021-08-29 17:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a22a5fb8c79843c97ea6e3f3e4a5cd1 SHA-1: 0d39f3311ec86a61a0aaa5dc445966c4afd4c6b8 SHA-256: bd7baaeb618a9aec6bf6f5eec7249ed661edba6aa9761efff6017d0f1ee6ea50
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9220

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://kurdumovldpr.ru/uploads/files/27414705381.pdf In PDF document text
    • http://flemingfamilies.org/clients/8/8a/8af36a28baf44bfc7b8a7004fb4eaede/File/bolenigox.pdfIn PDF document text
    • https://qnzar.com/files/16676728854.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/693394415.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/wedevajegelidadirutebev.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c25ce3dcd1---18819676028.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/budotodali.pdfIn PDF document text
    • http://katachizu.com/img/news/files/98030683675.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202106/1624140501.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/25907401900.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b69836fbc6---zatadekigezod.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/sazibanurasozenofavilonoj.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/37835346943.pdfIn PDF document text
    • http://trieuduong.com/images/Download/90186818796.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/zibabo.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/87146187559.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/5816913706.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/19/file/20210719_161206_200.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b29d05de009d97e1d7fffeac0f7c4915/56600480876.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/wugemaxon.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/gilotojufevopa.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160767337e2f6c---27722326851.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5119ec1b89---40614237926.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608084d4e7296---kutazusapemabazesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ssis+ssas+ssrsPDF 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_off0000d62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62F 16840 bytes
SHA-256: afd2cd4c4bab384df2f0571d3518f94178b9721f04d0696584c743a024f3419b
font_01_sfnt_off00010199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1