Malicious PDF — malware analysis report

Static analysis result for SHA-256 0393ea66b938d51d…

MALICIOUS

PDF

85.6 KB Created: 2021-09-06 15:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b0cdeb0e202d5c27b9896f2e3ca0270d SHA-1: e4596a0fc35103e83dec1416314486f2461d59cc SHA-256: 0393ea66b938d51d5226d51531be8eb1c3484c119a44f75e1161261b04d85d1d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely contains malicious content or exploits. The heuristics reveal it functions as a link farm, directing users to various external URLs, some of which are hosted on compromised WordPress sites. The presence of multiple external URIs and the classification as a link farm suggest an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://cambodiadriverservice.com/userfiles/file/36599254825.pdf In PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/acfd5b840330e5927113496f14387871/19851827755.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/refutudoritefujuwomof.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/zidaboreze.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a0f382912---wurinovob.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/26692259378.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/fewifubofifofenosudodofun.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/bagezidinovidunumuvinux.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/344b48cf461e21a4e54358862999f223/55267356020.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/51770957346.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/siroligudego.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/bonusozamile.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1f300d5f5ba9364f83ed4e8164dbcf6c/20179610337.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/82748377491.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/0bcd88a2eb9521f51349002992c1ee70/54970603085.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/955ng7c15ub7uejt2ne3t4jqv7/61834275214.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773ed216cb8---xurutop.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/rotosunokukexisulosiv.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/53364156356.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b40c84ae40---pevevuforezudejojasiwam.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6e86d68f3---39663927297.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/12395134065.pdfIn PDF document text
    • http://vpsystem.com/files/fck/86712522448.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/80347450385.pdfIn PDF document text
    • http://cortabellanews.com/userimages/5091937960.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/maxobojazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=tafseer+e+quran+in+english+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_off0000e4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 19496 bytes
SHA-256: 396204f88a7e6892b624dc5ad9e099a9e118819de4e3782faf0bd4b4e544cff2
font_01_sfnt_off0001188a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A1 10768 bytes
SHA-256: f7298f320651a86eca61a23006181a42e6366a1a3d2008c5bd5c45eecf1beebb

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