Malicious PDF — malware analysis report

Static analysis result for SHA-256 113878f72cac3486…

MALICIOUS

PDF

64.0 KB Created: 2021-05-28 07:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d42c92c91d8a302ffa418419e1d8dc11 SHA-1: 58078f511d8feb42a1e84656639beafc7e52ac90 SHA-256: 113878f72cac3486784d49c89a8c7b4dc4b8c1303bfbebf653008e906b766128
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and embedded URLs point towards it being used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8702

Heuristics 5

  • 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.
  • 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://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/e395f06782d616c7f254b69ba5af99aa/tajilenuvasabunozinu.pdf
    • http://k-yoga.org/file_upload/spaw_upload/file/20210515045319.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/n895tfnfc5b17aic6n55lg7aeq/nosudaperupi.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160765068400b0---sarozonisusudepaxewa.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/bc390b02722776bed2d447f21be3941d/bibepidodudedunufusixagi.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762a6ea8ef9---rikovepasidejusagad.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/a14b6c26b2fb2cf2671fc8707f64c816/75204445044.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16073b9b61422e---76174486942.pdf
    • http://anandtouristcorporation.com/uploads/tixukutabugiv.pdf
    • http://msslink.ru/userfiles/files/tanolepebidugavubikijuku.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/a9958dd21d0057876461999f4992ef00/46133689644.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/bfa945eff112ca6eb5f9f408154f6d9b/lupivofazorezubo.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/smtnov367lm6c1e3uftegjskl4/murapuj.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/64697942548.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a00a57b37aa---53321890179.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b2dcb6c4b---87807894447.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea0c86a23a---kizukero.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=formula+de+oxido
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d90a.bin
be4664d620dd92f566f42ed85b735ca8632ae51470c7c0392b7a9621a74a1ae1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 4816 bytes

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