Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e3e9bdfaf50595…

MALICIOUS

PDF

70.6 KB Created: 2021-09-21 14:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd19f0c3d9d5fd4ff93c096de792d5ab SHA-1: c78321c66280205981df7d543946fdc365bc1be1 SHA-256: 05e3e9bdfaf50595a8c60356cb919008f6156cc08b2d8a1589ead79751562d91
162 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. It also features a link farm pointing to compromised WordPress sites and disposable hosting, indicating an attempt to obscure the final destination and evade detection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5901

Heuristics 6

  • 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.
  • 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://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/gdq8ij7gc1e6pifmvun9insja7/pukovusexepo.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372d6a9b0a2---65229757444.pdf
    • http://mn-print.ru/ckfinder/userfiles/files/lilowerigij.pdf
    • http://shbaicun.com/userfiles/file/2021090804301873499.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/0b56b314ffe41c5bf4036632bc0a56e2/najesusivojalovezuf.pdf
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/tanofufokibonetanebo.pdf
    • http://liebherr-tr.com/userfiles/file/18807280659.pdf
    • http://bctlorraine.org/userfiles/file/90467327616.pdf
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/zoliso.pdf
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/nesabak.pdf
    • https://nieruchomosciprzetargi.pl/files/file/3780625339.pdf
    • http://itagqatar.com/itag/file/files/37474046181.pdf
    • http://belv.ru/userfiles/file/tigitikoduwami.pdf
    • http://kdbelektrotechniek.nl/uploads/file/rofubufaso.pdf
    • http://colorfusion.us/admin/images/file/rovipexijunafapaxomuzuwus.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161496a794dd01---31705529939.pdf
    • http://donghobaoan.com/uploads/files/89065429910.pdf
    • http://globalbando.com/DATA/upload/files/202109011222173186.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nusezaberezarupemijowot.pdf
    • http://punaide.com/userfiles/files/41265753952.pdf
    • https://kemxoi.vn/app/webroot/files/images/pages/files/bixaguwizulibajiruv.pdf
    • http://abwplazaview.com/uploads/files/kemavuforozilolazod.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=majili+movie+download+tamilrockers
    • 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_off0000e2de.bin
a2dca85715049e1227f1058cfc391d392842cf77fc51e94f33f73b3d2d329d7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 10896 bytes
font_01_sfnt_off0000fc12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC12 16792 bytes

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