Malicious PDF — malware analysis report

Static analysis result for SHA-256 83adc866d33f7d70…

MALICIOUS

PDF

62.3 KB Created: 2021-08-17 20:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ec134251ae5ab14df9c238c2fad657c2 SHA-1: b74373e585231ac0f2f8f0b14415ddcb730a1bf8 SHA-256: 83adc866d33f7d70bcca5d2a26e783b474300e7078dc6d495ce7fdf3f7340acf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to host malicious files. The PDF's structure and embedded URLs indicate a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7193

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://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/8492a70bf0b727bd377ddff9b67a2660/gesaki.pdf In PDF document text
    • http://aps-mes.com/files/file/42324487190.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/12955262782.pdfIn PDF document text
    • http://e-district.org/userfiles/file/9478973610.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1f6e04664---33766841268.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/5a6f4ff632d103cd114eab7e44bf5d03/97536974500.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/56799712682.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa1da3830f---janigenafe.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/muxizunivad.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/24878480973.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/926014786c559274d0b41c76fe1c806b/salezovomopifofopabogazab.pdfIn PDF document text
    • http://healingpawswisconsin.org/clients/a/a9/a991db820639e3552774ed9a746c1e3b/File/sitonixenonupumawipurokap.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210813031507.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae86df5a06a---luxozuz.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e9429adca9b---296370223.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/21f627b662514cac6d88544bcbb7e4cb/55533041524.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210630_6BC83FD746444BD2.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85d09307a5---45596596852.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/d1f2916b6001ea582b66ec4296537ae4/46335961217.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099a780a204c---pewonubazedebotuved.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c384f12cbca---gebetoga.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/a308uvgnse7mlrd5uhl1u5n7df/17160451279.pdfIn PDF document text
    • https://soltendance.com/stockages/files/kenagefaku.pdfIn PDF document text
    • http://www.toptehnik.si/images/biveruwexekuxotutelenur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=12+s%C3%ADntomas+de+la+borrachera+seca+pdf+gratisPDF 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_off0000d82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82B 11344 bytes
SHA-256: 5d5387acfc6f031ea1ab111f8b212843cca9971085b883d77e76761399b4c00f

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