Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e7eac6e6412d32…

MALICIOUS

PDF

90.1 KB Created: 2021-06-03 22:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0db266332fe7771f7cca9decfee628ee SHA-1: 8ab155bb193ebd481d9fa69d99db2b8f30f17071 SHA-256: 55e7eac6e6412d32bde8c568ee6905dcbc7d91dcd408b6f36730f14dc4e784ee
154 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution attempt. It contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8017

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://stiff.pl/ckfinder/userfiles/files/texezekisob.pdf In PDF document text
    • https://ahreco.com/uploads/news_file/pewetugiju.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/44862744710.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/i3krs2mjh7kk0qjbf6pspv47kc/48068887476.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/c6a7ed7184a967f5250c6ee1700a6c53/24398495359.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/25494389198.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8da3ab0c8b---ruviwudinofotela.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b132f1f506---12258425098.pdfIn PDF document text
    • http://sns.hu/_user/file/95353800080.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1ef35a3bf---31848760513.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9d539643d---kuputu.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b1dfdf3d1---wibutusug.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849394e7384---sefuza.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f20b67bd8f---panoparogawogesulune.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/mslanmcac7mu68nnqtkm7a34vd/zuwisejefezasarevif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=%25D8%25AA%25D9%2586%25D8%25B2%25D9%258A%25D9%2584+%25D9%2584%25D8%25B9%25D8%25A8%25D8%25A9+%25D9%2585%25D8%25A7%25D9%258A%25D9%2586+%25D9%2583%25D8%25B1%25D8%25A7%25D9%2581%25D8%25AA+%25D9%2584%25D9%2584%25D9%2583%25D9%2585%25D8%25A8%25D9%258A%25D9%2588%25D8%25AA%25D8%25B1+%25D8%25A7%25D8%25AE%25D8%25B1+%25D8%25A7%25D8%25B5%25D8%25AF%25D8%25A7%25D8%25B1PDF link annotation
    • http://medlab.webd.pl/upload/file/10414647991.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015101.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15101 11489 bytes
SHA-256: e5a054e725956672bdd522523c284ae014f5aa344373c8f428029d79ccb00ed2
font_00_sfnt_off00010427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 4068 bytes
SHA-256: 9093d88ed2f51c078dd44114aa35e5641b1c3a839509d1d398fe9e3f8c83fed2
font_01_sfnt_off00011206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11206 9544 bytes
SHA-256: bc7ed68fe216067c05b03b6deeed676b8f5cf876e214159bd6951b616dd4ebc0
font_02_sfnt_off000132da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DA 19000 bytes
SHA-256: 6c5b10fef8bb600afccd3788c32c8c32449ec63f2f7f5474ca0d08479cbb3ae6

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