Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8574daae2bf347…

MALICIOUS

PDF

67.9 KB Created: 2021-07-03 14:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6da0c5b568172c21fce7e3158b37037c SHA-1: 874101b0d76a316c3a80b30644194ece79f14d82 SHA-256: 5a8574daae2bf34790f7eaef6303e6589237a769846c9060d67e32d21452c480
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised websites, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The presence of embedded URLs suggests an attempt to facilitate initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6678

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://fulepmark.hu/nyebu/fulepmark/userfiles/file/51696988851.pdf
    • https://familienbilstrup.dk/ckfinder/userfiles/files/57938134412.pdf
    • http://youngshiny.com/userfiles/file/1623898403.pdf
    • https://systematix.pl/userfiles/file/21470232964.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/pmdnhbem1942v4o8vtp776p2p0/lebumujemofatoselerid.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d5490fce114---doleb.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/stkgkipbj3gs00ipg2b3chpeep/xozora.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/992072733b0c116092fee68406c6924e/87514451794.pdf
    • https://ofertaromania.ro/ckfinder/userfiles/files/51930538700.pdf
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/84801832145.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/qp8h94bpjtlc9j5171viej13u5/24522710761.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d82a76f133---1552964974.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ih1lb7nr5rrmr5jnlrovnkt7f4/3741152502.pdf
    • http://revucue.com/ckfinder/userfiles/files/45889480373.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/da31de973289f77b20aab5d4fb520c05/52168908310.pdf
    • http://odpadykj.cz/UserFiles/File/sarilujowasupizera.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/587554eef6f9788973088130268140a8/tosowemituxezo.pdf
    • http://emke.hu/uploads/ckfinder/userfiles/files/lipalevixiroroxipetezazez.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/0gd1u2k35a5f9m9asiis4r3c36/95742544672.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f249fe2a08---32479393668.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/29827651721.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=call+of+duty+black+ops+ii+weapons
    • http://s292376414.onlinehome.fr/datas/imgmail/file/68495769908.pdf

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