Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ccb530046b45e3…

MALICIOUS

PDF

65.7 KB Created: 2021-05-21 17:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d635e3dcd9c1e403cf735ff76f4dbb6 SHA-1: 922ef97167289a665ebad491af96e29d3d12acf8 SHA-256: a8ccb530046b45e31c1391ab1ac32ac12aeed919cb0f2cc21296e2ec1c2bbe7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to compromised websites, many of which host other PDF files, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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
  • 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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdc4b1742e---77282451401.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3c7f9f84d---54967911854.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1917e41b42b4f3ffceab4431e9cab1b6/dapodat.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9a460cb4a---94256622563.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/05ab7acdfdcc76a6d0b30dc046d82051/tirapikukokofutadezona.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c969686cc2---65948554209.pdf
    • http://dfh-consulting.com/userfiles/file/20698167858.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28c5a321e---7128834164.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6995506b4---97938470868.pdf
    • http://yilip.net/userData/board/file/63504970247.pdf
    • https://study4student.com/cache/fck_files/file/gibuxapomu.pdf
    • http://stardentalcare.org/userfiles/file/fuvado.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608556a13df5b---80301177934.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ed711a9f800ec57e5a52d1441553248d/woramakukozusirejikeza.pdf
    • http://premsaktidal.in/userfiles/file/gejibate.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=resumen+del+cuento+ricitos+de+oro+corto
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc87.bin
7e31485001d0505456ac1ad75fbf54f3372f72473d73f5eba32b59470a6372fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC87 4884 bytes
font_01_sfnt_off0000dd0c.bin
b4d6c03c67a0be1961be1f088c88d5454d150f6d8b63fe9e5a6afbcfa50eda0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0C 11744 bytes

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