Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee5ca5b63fcda5a…

MALICIOUS

PDF

72.4 KB Created: 2021-09-05 05:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f8bafa2227a39fbfaed848e78f676f68 SHA-1: 28c43b9e5368003ccb706c878a5692a1159b1347 SHA-256: 5ee5ca5b63fcda5a3fa3386240c58635b6f5165243458bbde7edd15a2ac25271
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the finding that this PDF is part of a scheme to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://bbu.vn/Images_upload/files/14276933886.pdf In PDF document text
    • http://envigest.cz/upload/file/88933841454.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/82128662615.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/pupasukedogevuju.pdfIn PDF document text
    • http://ridendo.cz/files/file/19748191641.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3314d91f97---gibirawunalesobo.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/77227842943.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/19425175996.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/416092228.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/68787967216.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7f07680b1---97763587339.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/771660a41e58e5b39bc16f0eb9980b3d/fepabemojato.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/melesapule.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/c04470aa7ca70936b51aa67f25a4a5ba/28145193078.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/49106964878.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/42905495721.pdfIn PDF document text
    • http://fkhd.cz/data/img/pogotanubozepukej.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/japuvifadimosuf.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/53230434977.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ba31b464f---lariwisawe.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/efvlq2biciidh1lskp79qeamo6/79882399961.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608723227d3c2---kominesoxubaga.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610c0afe5f09c---gudeniwagij.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/kuremegefu.pdfIn PDF document text
    • http://adveotec.com/img/file/saxedugefel.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcc23b2ae9---22825464947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=extractive+value+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://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_off0000bde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE2 15160 bytes
SHA-256: fe2cf4edc3278ab4d902b1e258877f0668f02c779da3dc5429c4db1725d99c83
font_01_sfnt_off0000e3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E3 10472 bytes
SHA-256: 6022f7db6d26158d0b9c02d2355124b5b33aa3f423eb8750aa518565d05aab01
font_02_sfnt_off0000fbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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