Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f593813382d869…

MALICIOUS

PDF

73.9 KB Created: 2021-09-17 10:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ced126d1adadd12b644709d93284898 SHA-1: 36b9be54d18aea040c88356cdceef375b84d279a SHA-256: 51f593813382d869936226cfa2d7ded0c2ce6950463c4362e586cd9eb558493b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to various domains, many of which appear to be part of a link farm hosted on disposable or compromised hosting. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns. The presence of a link farm suggests an attempt to obscure the final destination or distribute payloads across multiple sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://instant-image.net/UserFiles/Site/File/37741681116.pdf In PDF document text
    • http://galerie45.com/userfiles/file/60408939592.pdfIn PDF document text
    • https://armenia4d.com/contents/files/16976826908.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/radutu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/xalimanodin.pdfIn PDF document text
    • http://retailcop.ca/files/26552664174.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dumefedizebenuragu.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6b847e63---61882599521.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/totitutagevuximu.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/fosulamuvopu.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/guxegepiwijujirapas.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/71003931508.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/zudixasudagolazelizojomim.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/43654079233.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/86066814258.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/gilekupogituwekasezepo.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/widimiziladivawasolekud.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/radesaxunaxog.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce74079cd2---jezigurotibukutu.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/gekofukilifezojixe.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/23864745747.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed676645c4---50274152356.pdfIn PDF document text
    • http://generaldistco.com/images/file/likedozigul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+delete+contacts+from+phone+memoryPDF 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_off0000beb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB6 10984 bytes
SHA-256: 638e1cbd3e073fe9c88c1a0fcbc9fbbec16271f54d81fbd81c377ca6d243f70a
font_01_sfnt_off0000d818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02A 16276 bytes
SHA-256: 508d4da7dbade2f3828d60a9e160de0dea4b4fcc4faedafb27a3810be58e212a

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