Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a916b635a3a9e05…

MALICIOUS

PDF

72.5 KB Created: 2021-10-04 21:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: af653d34649acd08f3b1136175f8de75 SHA-1: 238f0ca745c1663f62840f68d91d502c545a3cf1 SHA-256: 4a916b635a3a9e05cdbc6c3e4e03be59cdd57465cd7702876d4789cd085a7590
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://studiomilano.eu/userfiles/files/41191754380.pdf In PDF document text
    • http://soleilboo.com/images/uploads/files/tidubo.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/82411208849.pdfIn PDF document text
    • https://plasy.com/uploads/file/53419785270.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/zufusuxidigaxuwosaj.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/40454848139.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/48527588393.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139677e6908a---sotimagev.pdfIn PDF document text
    • http://techmechengineers.com/uploads/79161653053.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/tugiwuwe.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/87036760984.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425406cc355---vadutopadividexezomot.pdfIn PDF document text
    • http://zeamailer.zeapost.com/FCKeditor/editor/filemanager/connectors/userfiles/file/21955756856.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/78720775395.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/61455545337.pdfIn PDF document text
    • http://iltorg.ru/upload/file/70382881483.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/81957418590.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/15764628478.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/zofakidetutifiwobemobuxip.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb1e2bdaa0---joseluduwu.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/pubikerusajufofokifabib.pdfIn PDF document text
    • http://webbuilders.com/files/file/97108888089.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/lekegalixotowajuwudi.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19475627916.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/8664767183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=panel+data+research+designPDF 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_off0000b906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB906 10528 bytes
SHA-256: 3b5b049dd2d55f917b9adffdfaeca68cde419a265f6c70894009af065f96bc01
font_01_sfnt_off0000d0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A6 17252 bytes
SHA-256: 73bc852c4188902a3be59e41966a69c4714049ac56f19b9b5350b22f6308f28b
font_02_sfnt_off0000fcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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