Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dde1cb7ef0ac7cf…

MALICIOUS

PDF

78.8 KB Created: 2021-07-01 18:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d09cc122e467a19aad69639e2dd6b6ea SHA-1: 35cff44951e08ecbcf0537b9a298dad27557facb SHA-256: 2dde1cb7ef0ac7cf2bad4cc9bc8b50d76b586e65d584804470ac6c69ca9be27e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/3vlm5gvajf4ug1c85guuhdh4e3/82629398582.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/65f988229b82b6f6855aaf6aabfe342a/17589943106.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/1c1ed2c2bf44ce4288148fb76c9ccd77/vijifa.pdf
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/firinavugaguwabes.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4b7954562---79871229458.pdf
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/zuvotikixutumemok.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073f43606867---zolazepuvedegusobokun.pdf
    • http://homelife-superstars.com/image/files/32363248404.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b3e31cca2---36153199347.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/wevudedevutotapusimel.pdf
    • http://gsprojekt.eu/userfiles/files/44293490047.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/co6q827ftpklismu6ga91vhlu3/3699451132.pdf
    • https://luyenthitoeic.info/userfiles/file/nufoge.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/svf191ipq63otvg0cjuqfesksr/zomix.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e4ba01e0eb2d1aa51e5a8a94a31fb15d/solofumen.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=nv+child+support+calculator+2020
    • 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_off0000cfee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEE 16792 bytes
font_01_sfnt_off0000e800.bin
6517ad0ea5beee2c1decd7966ee6a35cd51b81f9e99351bedc2c8fc926b0ff9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 17396 bytes
font_02_sfnt_off000115a7.bin
3c9d9faa24cd55b62e5f271b5b8c3166ecc8073e5a298e6926c755c0a1eab89c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115A7 10760 bytes

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