Malicious PDF — malware analysis report

Static analysis result for SHA-256 063412b246d5567b…

MALICIOUS

PDF

78.0 KB Created: 2021-09-07 08:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c5882f761028bf994760880885ac023 SHA-1: a1a8e47a62f5bc07e6873e8d456acf9f5d27ad0a SHA-256: 063412b246d5567beb40152516551f102d697ab971072c6cd8df2a606c716cc2
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5192

Heuristics 6

  • 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
  • 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://loctra.net/userfiles/file/53873004785.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/10074466675.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/85025884741.pdf
    • http://humanitool.ru/userfiles/file/tagibesuwuvajitiva.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b2c1d3379---54853883176.pdf
    • http://ildongwire.com/userfiles/file/77284531991.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/89e5a3eed63e6c5d94876dc741d283e4/97643581948.pdf
    • http://www.urbanwaterways.info/files/sopufelafolabanukatupuf.pdf
    • http://camberwelltaxi.com/survey/userfiles/files/19354504995.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/0f8e29dcad578e6d94914009e19ad9b5/6972888056.pdf
    • https://brianhigbielaw.com/UserFiles/file/wegidi.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161068a39049d3---bukejinev.pdf
    • https://burgas-remonti.com/userfiles/file/nanuresevuwemejebiru.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070e805eb24d---tobubumukidizadapi.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/181015129160d966b4a95da.pdf
    • https://habibitours.com/ckfinder/userfiles/files/15832963421.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/096f674770620e675d4c72ac574b036f/67125335728.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/645c28450e1d4da312fc2b8f3661b761/58187885182.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/31716169566.pdf
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/doliwajotowoloror.pdf
    • https://anmimar.com/royal/userfiles/file/xesivuj.pdf
    • https://avenue102.com/uploads/file/webufimemuzalan.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=scout+knots+step+by+step+pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e53b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE53B 16792 bytes
font_01_sfnt_off0000fd52.bin
b21b49bb5bea0d9e9923ccfd507e0124c7c72e99f52f177aceb670ce1bba08da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD52 10736 bytes

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