Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a18e719802485a…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 01:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 21432bf345982598ca96db9a5470fa79 SHA-1: 8aba3b803fad0524df7f354d5b423f28444fcd4d SHA-256: 05a18e719802485a9e4674ae323a3691356c1927f1445b94e9fc48338dcd71b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and ML classifiers. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The primary intent appears to be redirecting users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://gskrem.ru/img/file/vomozuvu.pdf In PDF document text
    • https://questyme.com/userfiles/file/zurujufegowepapo.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/18460159845.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/85604567824.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16148b4a714199---refugizizaloluge.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/78476158723.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa6b876caf---womebazugudibadagemaroju.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210910212309739436cnue3v.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1632780623.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133b4ae64411---22370938498.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/gavewuniwulado.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912e2c0225---zogikililupuwuditi.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/mepewelepokisukogizenuju.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/sibisomibofafaki.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/nilamidunaboxonomanefotiw.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/66250286417.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/vopurelalotalo.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/lasesifinowexe.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091205522780.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/90714487200.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/tesiwejoxafoximigepidalu.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144f4dcc6d72---48149076033.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/83570398961.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/80902156892.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/vaximodivus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=simple+present+worksheets+for+beginnersPDF link annotation
    • 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_off0000b396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAD 11036 bytes
SHA-256: 03c21eb996ade993b65d06d8a437e05c7fbcc05601ed83c4d0485adf2e6ffdf7
font_02_sfnt_off0000e4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F1 14908 bytes
SHA-256: cbec599020ee71ce122fe558d3d7e7bf747d71a6b61f34e5bfc6e64b0b436a75

Open this report in the interactive analyzer, or submit your own file for analysis.