Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd08e68a778b94e6…

MALICIOUS

PDF

72.0 KB Created: 2021-09-02 18:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 53a151f7622a84066e7c62e6456e947a SHA-1: 2c6e19de5e57ce54c482245635efa1038a0b0078 SHA-256: dd08e68a778b94e6f4de18659e0b79470bbe225639cab0e2fe32223e3f239e24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was detected as malicious by ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs that point to other PDFs hosted on compromised WordPress sites. These linked PDFs likely serve as the next stage in the attack, potentially delivering further malware or leading to phishing pages.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3855

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
  • 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 https://huntic.ru/uplcv?utm_term=pinocho+cuento+original+completo+pdf PDF link annotation
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/5v7inu9bn5ghrf9m77mah5up0k/lifilimefe.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/safjsvfb6vm6ceghvdjqldqca0/93745265179.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/61840951422.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/37915494188.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/91069344848.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087c364c9ba2---tezin.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086659d3ab4a---11255161134.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/fajedojen.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16112cefd54b70---78926039359.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/govolavisowubabejuveva.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/jhth4pavtp860qvncuir0273pv/48793621832.pdfIn PDF document text
    • https://wecareprogram.org/images/file/42331590175.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/1468c52114ff65c87518230137144347/33821841596.pdfIn PDF document text
    • http://huiking.cn/uploads/file/071739397279.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/sanumibigi.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/9c312d21fd4647768161f8464112d877/20065432507.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/kuxujusijasir.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/vifaxekoxozokapigejib.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc8a239e0---58270699150.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/tolaruf.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edbcf6bca21---sufirogizojoxawowexal.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/4a8ee42d4c2fb282772331b505e2058e/potivabi.pdfIn PDF document text
    • http://cwesp.biz/upload/file/52264444804.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/6fea7f4baf253e7900c2f3523e35fe8c/44750127941.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/10141131299.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84D 11000 bytes
SHA-256: a780001478d0f287e8ea3f872d2bdcde4aa99fede6a2880cc86a28b4196c3a63
font_02_sfnt_off0000f16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 16984 bytes
SHA-256: 787ab3d939a18542fd7ee2a69d220bc1781bb90679dd439bd537d3292f6a838b

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