Malicious PDF — malware analysis report

Static analysis result for SHA-256 36612d55c7bb0ec7…

MALICIOUS

PDF

64.4 KB Created: 2021-05-18 03:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a414bc950f757c5392d31d9aa44eb07d SHA-1: bcc31c177254af06a6ac2cc18c15ee26dec6c7ac SHA-256: 36612d55c7bb0ec7d133172174b0f6dd412aef5d98e6d84175c0e891f612cc6e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'Grade 10 chemistry questions and answers pdf'. Several URLs point to compromised WordPress sites and other domains hosting PDF files, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure point towards a phishing attack, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8888

Heuristics 4

  • 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.
  • 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.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3a6128fc0---73090405980.pdf
    • http://allamericannursing.com/userfiles/file/13967174533.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/5ef339e558d380711e52628d06d6c986/luvimadutufidotupo.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-12/20210512052143181407.pdf
    • http://agcslohian.com/userfiles/file/69840162559.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/3e7f04abacda0bb3ea9f61621ab681f4/70287020521.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/9b5d783b8f23bc13611bdc7f3d2d545f/99808580534.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/5d034d0eb48c75e985fe26461ff15fab/winefojekepesekuv.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/44e6f2badebf2de49e2bd79cdf7675ae/xujotodaxutelugan.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/6ce2dc9f08884a118d1136321f85bbe5/12305792450.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608be1207a735---6302791030.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844fcd9fe23---gozakigirujeburolog.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc9e327fff---82671763662.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731fa710a44---pezomelogatugisugi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=grade+10+chemistry+questions+and+answers+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d09b.bin
9c9e5759a36097ad97a5e872ad3207e9907eb6b1eaafbf5609e15614c627aa6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD09B 5908 bytes
font_01_sfnt_off0000e4a0.bin
d350a0440ed5ec879e204f54c917b6ff8220c796e0b785f2e8ee2de423194820		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A0 10448 bytes

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