Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3760d006c2f888…

MALICIOUS

PDF

69.9 KB Created: 2021-05-15 08:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 5a2dc82bcb526abf7619e062cfd389eb SHA-1: a0f5e589aad5675839fac079648b222cd3089d3e SHA-256: ba3760d006c2f888ee489652848d16ea89022196e4e455c29f8e7ecac8a3fe48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating it likely serves as a phishing lure. The document contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URI heuristics and the compromised CMS upload link farm heuristic further support the conclusion that this file is designed to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jjmcp.jp/userfiles/Image/file/ladujilujagerobinut.pdf In PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2a1ccc9f9b3148b8b00c4ba851f54a87/67930410378.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/c1cbb4c7fe5f618e382da683f7896eda/suvisuwigoba.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e64f5947a19b7d64eb5f191b9ad79dbe/nobagavawinotala.pdfIn PDF document text
    • http://simonide.org/userfiles/file/66313531129.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d41d0708f---61299170092.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160894efb71a93---23898976100.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714a2fe02ef---siwizot.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/20840759776.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3caf829ff---razalilotab.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b1a35d911---dokureso.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/27053776687.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c2c8ebce7---birowafavuligo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=expense+tracker+template+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BF 5388 bytes
SHA-256: 52d84e2428970716412ce160016f1167dd0e2422cd6f39f0af6b4377411c5c19
font_01_sfnt_off0000e601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE601 10864 bytes
SHA-256: 049a5dfd57b0bb03ad8a0b2e71d5dccfca2607d63358ba5bb0f389432904d399

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