Malicious PDF — malware analysis report

Static analysis result for SHA-256 5276a81afb2afc93…

MALICIOUS

PDF

76.2 KB Created: 2021-09-23 19:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d644a813223fe647907aac18ef04c47 SHA-1: 3bc172df346224da5b5bac35ede1e7b17766f13e SHA-256: 5276a81afb2afc9302d4509c327b8ca87bdac14980d5ea15dffcf9430ece5d9f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and multiple links to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7741

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b17ce3e9e6---sinuxepagulotuwobikiguri.pdf
    • http://gapp.fr/medias/files/kapekota.pdf
    • http://thanuyentea.com/ckfinder/userfiles/files/6501535455.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134a69aeae6b---zenavegufomuperesibimoda.pdf
    • http://inteko-tula.ru/f/file/60040918573.pdf
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/xisidabebonitif.pdf
    • http://hoangnamjsc.com/upload/files/rabisixu.pdf
    • https://phr4u.com/files/15824825075.pdf
    • http://opsir.eu/files/file/xapujutexutegetirazoru.pdf
    • http://jysfh.com/upload_fck/file/2021-9-8/20210908105313200908.pdf
    • https://www.bosingels.nl/ckfinder/userfiles/files/19200471560.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/vrrrlk508916d4ee1heu2kcpv3/zozezevafesijudodurilumuv.pdf
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/51605028115.pdf
    • http://dansungsala.com/uploads/files/89843450061.pdf
    • http://live-net.it/file/lovajadowifidokarujebi.pdf
    • http://biomax.shop/filespath/files/20210912121735.pdf
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/vugamajodobewofukibesuf.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5i91s772m178q8talr4e2kvqjj/97552311775.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=use+android+phone+as+monitor+usb
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ec.bin
4b5ef0f53ed9c451d402d89954368f3c7d6744a920d84aae3ab20023cc731934		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 10856 bytes
font_01_sfnt_off0000f98a.bin
2ba79058d24fbe62c8018c694a022ff42cfd4ce86488fc413c2da65949d758f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF98A 17620 bytes

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