Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3568ff909673763…

MALICIOUS

PDF

71.6 KB Created: 2021-10-03 05:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bcdce0ce4815ff47e08611c2e22b7644 SHA-1: 9995b4320e26abf75e7ed607ce8e69e7c7ff107b SHA-256: f3568ff909673763590652bcd02d65db9d56d8c1ed91903995bf97707b2fde02
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/76308720356.pdf In PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/93277604813.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b48e9c8920---60506985543.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/kudelapatox.pdfIn PDF document text
    • http://jinyezi.cn/upload/49248732373.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d209e55c34---74890515832.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/bizirumijuza.pdfIn PDF document text
    • https://artemishosp-em.tw/uploads/files/202109231509208890.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613586fad714e---59882002689.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614f2fc15b3fd---64811160143.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/51865191860.pdfIn PDF document text
    • http://m2m2design.com/userfiles/40003371506.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/90725163772.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ea46b7ac9---77238656467.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/rapis.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/44782496513.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/sigakopijejasolotud.pdfIn PDF document text
    • https://baptistfriends.org/media/rowodik.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/nusujavipagukomuxev.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/87449078166.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/ba5f358dcdd5cde58de0bba9a0f20e95/74966722714.pdfIn PDF document text
    • https://istanajp2.com/contents/files/35632999205.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/f73b90d0c1a37ff41dd599fcffcdc293/13140184209.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/gepagukij.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/38065649392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=a+frequency+distribution+is+a+tabular+summary+of+data+showing+thePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000b382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB94 16532 bytes
SHA-256: 919d0fb9787615616eaf6975de7707a3e5fc5bb3c946711c5ea09e986274e3b9
font_02_sfnt_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 11488 bytes
SHA-256: 5af206fbf22ffda0f7fe2c891ea25cdac3e8aa76a22fcb91abe163920b885018