Malicious PDF — malware analysis report

Static analysis result for SHA-256 2390e316cb6375cc…

MALICIOUS

PDF

83.3 KB Created: 2021-07-19 07:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c741bae9df5555d1e4870d563a8e19a5 SHA-1: 19985595bcf83a207da0e784d3b79404d78c5253 SHA-256: 2390e316cb6375cc28fa0605778fb6bf75ac5d65a69575b66238f4ce4083967f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6efb8f6d4---89255605127.pdf
    • http://nadiadsa.org/userfiles/file/56952909381.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcae8a46e92---65787989744.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/5crivq7k35gh379ccd9i2unhj1/sipimijelaposugivetes.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/78960081754.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608de2af11b16---51396696035.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/9f9cf40f1fce47e6a4eeba816ac5e7dd/pozefezowuwunajaduke.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/p9qiu3ob07oqvn5pceijo8cf71/kexumurodeteweradozel.pdf
    • http://akcjonariusz.com/UserFiles/file/giletuzagix.pdf
    • http://ducthanggroup.com/webroot/img/files/45430232337.pdf
    • https://koncnc.com/genelresimler/file/24005684257.pdf
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ribepal.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c4f38a4c3bf9f9e7ec6a937f27710fcf/48618566406.pdf
    • https://nbtele.com/en/cache/fck_files/file/70687997308.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e7d3a920d66---20149545924.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/c7ada9bec87d8a9e25f7d9f69c46ee1d/nuviwivogi.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/p6lneqnu32s84sukstus2kbpdb/33572617442.pdf
    • https://capecoralliving.com/media/file/zigarexurapuxuwa.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16072a2f8301de---83146783654.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/c3b8dd982dc11e214367618b623be140/20218779085.pdf
    • http://seoulsquare.com/userfiles/file/84201320151.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/4q4kdvglis2ktoas7mn6vj2akp/8186756239.pdf
    • http://speckrepeg.by/UserFiles/files/36018011014.pdf
    • http://akkoryazilim.com/userfiles/file/68686604901.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d1f2a2676---besojonovog.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=give+me+example+of+quadratic+equation
    • 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_off0000e30e.bin
770ceea453f863e56c3a833e1ea939289412b1891997dfe346b42c30ddf7be79
pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 11068 bytes
font_01_sfnt_off0000fc9e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9E 16792 bytes
font_02_sfnt_off000114b0.bin
faa22ddfd383a06228dc4da520e20a076eda5961d0b4803eade7919ba7789e55
pdf-font-stream PDF embedded font (sfnt) at offset 0x114B0 16624 bytes