Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0131cc07543894…

MALICIOUS

PDF

88.8 KB Created: 2021-06-28 08:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e57421ab4c88173cf1d6bcb3ed372c5 SHA-1: 04464974c77556371d265a81e91f4c116a6d1554 SHA-256: 8c0131cc0754389476b47a5301c15a236d11dd46c765a4b00e07ca25f163c3d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://brooklynsmokeshops.com/admin/images/file/55979417600.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16086db78926b3---42165899350.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/2638fc031a355257ea84cf7122ba1a01/gajuvomomewiterosi.pdf
    • https://bem-sa.com/img/file/26133891286.pdf
    • http://digemnd.com/UserFiles/file/86863336690.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/osujjvqneriid91d1ml899k23g/29255851834.pdf
    • http://sjar-tech.com/uploadfile/file///2021061621180869.pdf
    • http://novichiha.ru/pic/file/famivarijulisozemugekej.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a475a431dce---potawatupebisojiwatis.pdf
    • https://osiindia.org/ckfinder/userfiles/files/1399982509.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b67dc39b70---31044889093.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/e512cd9bdbf99c0bcd24081301b8995a/57674790585.pdf
    • https://ksuskalology.com/images/file/dejimosomomovu.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea109557ba---serejojonufowusufezaz.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/7vt0vcio6im985ujgsdrqkn4sq/wazenolanofolu.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/sscfrl8oj0kh14mpnfuj7c3tpl/mozazipirosukonorepu.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/6e2260e254fb7d9d7119c9352a8bfee3/66410074641.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160966ed7182b9---26979767795.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9862d5e1f---somovekuta.pdf
    • http://a-swiss.com/upload/userfiles/file/61531961502.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16096f5acdabae---xapunowifatagetapepitub.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=52.5+divided+by+7
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbca.bin
4e486dce4cc0a061bb1c83956bd8577c25ac2cbb288dad44ccd9cab79be3c955
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCA 10036 bytes
font_01_sfnt_off00011242.bin
ebb6cec9781023ab90054c566915cdcf258413807173334b5e4365ff221e730a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11242 16936 bytes
font_02_sfnt_off00013e44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E44 16792 bytes