Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1e2d397a88773b…

MALICIOUS

PDF

91.5 KB Created: 2021-08-05 02:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5d2a8486128b8890c5b2b25890e33baa SHA-1: f537c9ab45ce72a216b709f34a9c0e07af41c7c9 SHA-256: ef1e2d397a88773b06f8760e037a05e26b96f42618f7d460eddf5426b313faaa
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URIs pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8085

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/b40c2c8740109ca97b79b1e53ed185b5/jugegagivowozemazaxo.pdf In PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc9feb599e---40191543766.pdfPDF link annotation
    • https://aodaixuan.vn/app/webroot/upload/image/files/75535183921.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/68364793070.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/dukijogofalelapevumo.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/509245e575a77603444d78c4e6c808da/54556226233.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/240471248.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/37450248828.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608198270fd4c---21402042118.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/3f51f50ed224bacdc782960bf3db546c/5619138456.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/31028712713.pdfIn PDF document text
    • https://ever-progress.com/upload/files/kudamifinuvidivedisixef.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d2c998551---94630885653.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/bunakizane.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ae2c959e---30417305238.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d16ec9e511---fawoko.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/99779163976.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/viwagawi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077e747c47c2---87228044272.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/liwatetidizakulojodor.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/9c926677f2a4b21033a2427b7c684239/14445461746.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/68711506271.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/75026842342.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d7822d22c---15067107917.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/86874347395.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e12ea92662---faxavajekikunizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=duralast+700+amp+portable+battery+jump+starter+manualPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE62 10976 bytes
SHA-256: d7ed2f2b43d3e68d88f55d7cd13d9331503508054e0e0e08cc454b3768062166
font_01_sfnt_off000117c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDA 17512 bytes
SHA-256: ca101dcd075dd03b2c27919c86f78b0272d8cd30418193013686f7a962827ebe
font_03_sfnt_off00015ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DDB 2668 bytes
SHA-256: b698b531a87b651ddf6a9a592ce8676b2861b16996b8d9d6dae956c08bc9f40a

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