Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb056721016bee16…

MALICIOUS

PDF

77.6 KB Created: 2021-06-19 15:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f99b0110d19935afe1368f9bcd934cf5 SHA-1: 10fae12e6ed5b68238c7ac9c90a1a48fa5982ef0 SHA-256: cb056721016bee16931fb05435b5fb936410955c6e4ab2a0217c6ac9337959ab
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to an 'Arduino tutorial'. No scripts were extracted, but the presence of multiple external URIs and the overall structure indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8746

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://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160819408e5c53---84553014261.pdf In PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608719cc2e36a---durepovulogupisamoxawa.pdfIn PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/53700142179.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/38211620650.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/p9qaqink45iuem9jqm9g9686hc/36950594787.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/66973da523d3ac5a7d045eb86a87c4b4/moxekorimizuxufaxapeg.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085c2eeda5c5---56241817520.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/77877551697.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05867d6345---25113382545.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6fa512af9b839ca42b5b0305a66e6ce4/resasoxeruxilekojefeb.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607278db5b9e1---44261615456.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160927cf704e16---42692556478.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/37644180834.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/jidofuwakirovigezuwon.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21f49264bd---jakakukomutudoniwudezib.pdfIn PDF document text
    • http://megalaserasia.com/upload/%5C/40127681054.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/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=arduino+tutorial+pdf+sinhalaPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text
    • http://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE27 5120 bytes
SHA-256: 3189e8281670dc0782aa2e951f70c013ceb8f9e5eb52e7ff6d02dff2e90cedba
font_01_sfnt_off00010f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F48 5760 bytes
SHA-256: 290f69f1e54b54a4f1f03cde015c68c37367d5d870c8e718c5cf45892b5cde97
font_02_sfnt_off0001226e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226E 1908 bytes
SHA-256: 5c52fb878efedd82abf199b75d2100ab973bcc3198bfe9992aa3b4e28e34aa2c

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