Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c9e9a315169bb0…

MALICIOUS

PDF

61.9 KB Created: 2021-09-10 03:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d672692b9e47098c9a51c86263b63b1 SHA-1: 7a81e6d3c635f365d044b07ea3356633658a873a SHA-256: 88c9e9a315169bb0d6ec0764053c151d65c91a035e685a6e672759b4448e6a7e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9142

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://nousgarage.com/userfiles/file/54252708658.pdf
    • http://jullien38.com/ressource/site-image/files/87433668801.pdf
    • http://topliving.sk/userfiles/file/jafinatogitatija.pdf
    • http://controldellaves.com/app/webroot/arxius/file/31557244444.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/dilaw.pdf
    • https://5a.ro/ckfinder/userfiles/files/50619822976.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/7vu86m7t2tj34djd1r23g0hjs6/dufowemikeg.pdf
    • https://brs.jo/userfiles/files/demorasuwavafiwen.pdf
    • http://azbuka-d.ru/ckfinder/userfiles/files/93750564519.pdf
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/nelag.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/io95dblkkke1h08ul0qcblnofv/2940833134.pdf
    • http://isleford.com/filespath/files/20210908021031.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/4533487836.pdf
    • http://hytechplus.com/userfiles/file/58294653480.pdf
    • https://webhosting4.net/media/file/disowotomo.pdf
    • http://myappartement.de/web/editor/files/55433365259.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5cf22947a---25297636613.pdf
    • http://toanlinh.vn/upload/files/70191020214.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9024ab616---76022927949.pdf
    • http://savvyais.com/userfiles/file/xojosimilugu.pdf
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/ramokagejetegekalugepusan.pdf
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/88309069669.pdf
    • http://cbstav.cz/file/62996317580.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=angry+bird+epic+hack+apk
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd19.bin
8f5313358eef0067019a8e395fc97d8a5c2de06f027b43c92a7ecda8c89a9969		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD19 10688 bytes

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