Malicious PDF — malware analysis report

Static analysis result for SHA-256 8253fb541a58fcc2…

MALICIOUS

PDF

63.6 KB Created: 2021-09-11 16:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 89022fd4a7477107b6cdb989b71ffc6c SHA-1: dd81270dd4c6edbf3b6eac6af0b58341e3fed820 SHA-256: 8253fb541a58fcc264f439dc71cd4415c7a656675c9c26eab4a39d8e163431b8
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised websites and disposable hosting, likely intended to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7270

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://ketchas.ru/uplcv?utm_term=5000+bloxburg+house PDF link annotation
    • http://refah4ter.info/basefile/hotelrefah4terir/files/nimusazawo.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/basomowamumokil.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/18911128359.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/70334130091.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/86020176758.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210901193322.pdfIn PDF document text
    • http://kbchina.de/upload/67977142167.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/mgjpq15l4912372446af207if5/soviwojipupiwomujaforobo.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/gogig.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/24639881840.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/3c9b7a387706aad6f6e121d1cc2240b6/60837499812.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2bef4ccf1---84369123242.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3dd3e435e---senerakovasejovepeniseg.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/vinobefedugobewi.pdfIn PDF document text
    • https://coevent.ru/upload/files/fagopunixofaduwufo.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/2ed2ecbb265cd8caf0f47f41d47ca3c8/88413710775.pdfIn PDF document text
    • http://screen.by/images/file/65417352224.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/jodazupevenatolola.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/23259260820.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/1306621472.pdfIn PDF document text
    • http://gazetavk.ru/img/file/gojutavovabutexavuwom.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/92728562404.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/dareru.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/92180829395.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/penibaso.pdfIn PDF document text
    • 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_off0000db8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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