Malicious PDF — malware analysis report

Static analysis result for SHA-256 593eb1274cb6c420…

MALICIOUS

PDF

96.1 KB Created: 2021-06-28 01:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 042b3c131693ee301654b7d23c0c821b SHA-1: 4ca65ed047498695a27fdfb8d897e8f1924080f7 SHA-256: 593eb1274cb6c420de1474e327a821feb0d4288d47fd7fbb07419e79de87edea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the nature of the link farm and the detection as a trojan indicate a high likelihood of redirecting users to phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://newgrids.com/userfiles/file/demumizabujixivep.pdf In PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607e492bdb541---86861518355.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/0352d14q8oairal3np335ikpp7/rebawebubil.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16078c1cfac1a3---topatezezu.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609078c9b49fb---radulo.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/fp0ov701vnnv607ur7eu7uh3vh/71868618416.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/nodekojisuf.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/degevosepuzodujufojef.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/nebolefuvemiso.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/5seov44p09jqd3goglnv521bf4/82441846818.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/dozedobimodomewalamala.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5adb24ed93---xejubakufejasivakedodebaf.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/7693af470e361fc572289217dec9e11d/nixexibelivosupabu.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/badf2ed58072a42ac444d4c5ebba7f57/80606977960.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebb9518cb6---47693112781.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cccb7732be---bujigowonazitenoredobaw.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/mesejedugejexopatasujo.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7b2deec6c---29427763059.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pofimeni.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094926a1e690---nasanevobegumajefafidenuw.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/66539997412.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b142aa1e66a---zevujenizu.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/125af3a38d1b3d31031cc12f75f1679a/webinotofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=banded+iron+formation+diagramPDF 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_off000114f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D07 17420 bytes
SHA-256: 1a38a0795b62f37f73e9a7826a02ec3933d6077ba8bfa84c8001fa2068b05920
font_02_sfnt_off000159c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C1 10536 bytes
SHA-256: ed366c8a8c87c396c0ef462639fd68fc4d3b22fe9601c4c7d0bcabb5df2edad0

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