Malicious PDF — malware analysis report

Static analysis result for SHA-256 3292d71e546ca522…

MALICIOUS

PDF

71.7 KB Created: 2021-09-11 20:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b1171d7cf55e48d47c9401a2d36e23ba SHA-1: f33231a0fac58aab81558291928c41cdf9334b06 SHA-256: 3292d71e546ca5227c4f7f324b9842e0e870e9054fe8d47956ea32216c1de023
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple compromised CMS upload links suggests an attempt to host or distribute further malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6220

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 https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/vofukesanojobakafoxemen.pdf In PDF document text
    • http://a899.net/userfiles/file/rarebazolijaga.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/09195349916.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/sugupaw.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/29842841147.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/37786449818.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613a213e322ab---dasasakawotadobijuwax.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41249891446.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/3922469201.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/gegemagobabewezunatevufe.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/c0deaa91fb3cb2c0fc4b35e7cf33317d/tanenadivuluduzelaw.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138df2177f78---kanolenogozavi.pdfIn PDF document text
    • http://topstec.com/d/files/33609344575.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/11909896970.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/3874136099.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/kokobavasariwavirizo.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/bozutezuzomupigolag.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/52251039324.pdfIn PDF document text
    • http://gewald.ru/content/Files/modajakixida.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/49998110674.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/9b714828260a7cb92b34b149a4e5a8f1/39767475654.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/kewizusizona.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/74551708523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=root+app+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72C 9740 bytes
SHA-256: 0ff1d412085c88517d883dc5143dcd4c57f27a600a66c92419f78861a56a7d5b

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