Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b49d9e4717c98a…

MALICIOUS

PDF

72.5 KB Created: 2021-10-04 04:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 116205c8602a748261ddfe8d456c89ad SHA-1: 3654705720fa5d72aca227e34f1bfff0f5c8a73f SHA-256: c7b49d9e4717c98ae84e78d3658186c157affc85fad9ee8d9d93e7ecbf499cdc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or malware distribution attempt. It contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://smidgel.ru/uplcv?utm_term=sum+of+ap+from+last+term PDF link annotation
    • https://sfeerweter.nl/userfiles/files/pojunijitetiluto.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/botixe.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615363c6b1e4a---fezixixosifogududiweve.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16152e1d291906---72861770860.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109250236597921.pdfIn PDF document text
    • http://www.77ice.com/upload/files/43476957953.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/dumekizikitenogugukis.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/pewebalos.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161355e086bd29---43602477346.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613f516f21953---83233114127.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/kijituvugeditupujog.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/75008747618.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16155a45b4d04b---pomuvedipabowa.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/94780736232.pdfIn PDF document text
    • https://wineart.online/userfiles/file/pasevejiz.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/56983867636.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/xubewifegasonuser.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/874ac7cbdb7bfb554ed1e2104daa0bc1/jobuditazuzigola.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161358bf64000a---20519992462.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/4513696405.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6f65a2890e9de43be6a5f951352b1fde/dulifanixekamojizoboxu.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/pumonavawovadoporuw.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDB 10500 bytes
SHA-256: 5ba9999d71fb579166d09851eb39fb482083ea1c36be4f4c22c51d6218d9b065
font_02_sfnt_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 18248 bytes
SHA-256: e498f2f2becf1600bef390e1171b7a2f9f4792ad8832069820ed03f767d0d4db

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