Malicious PDF — malware analysis report

Static analysis result for SHA-256 620cebfa9d15b28e…

MALICIOUS

PDF

86.7 KB Created: 2021-09-04 06:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b84f6b8ad70252663287d8debd4c082a SHA-1: d3ada7f62fba7903c2ff7c0e1cbb8405cd94ffe5 SHA-256: 620cebfa9d15b28ecef6d042397ba6958ee09b42b77842e9881904fe6524effb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098312208693---pazaxu.pdf In PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/44660896459.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef7d2aa637---gilibes.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/nasoxoponedop.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ple47asgfe6isfirfj29ubp530/71591716032.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/binerinozuzogevugapetota.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210904_97094724E4558646.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/sidojorariguzu.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/b22d0ca93bb0aad2ba0cfb985e1c7f6b/16384154431.pdfIn PDF document text
    • http://timesofbangla.com/uploads/files/wugijereziget.pdfIn PDF document text
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/dijukijo.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/givomem.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/nizesituzexexijerate.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/vf48l9jsqa381tb168ubfbbbvn/13346894673.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfd23a0065---mixug.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/dakabirutexufomumaru.pdfIn PDF document text
    • http://beril.cz/userfiles/file/59062421356.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2n234o0konnrbiet596aq3vj31/jusaxipexepigogotuk.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/zukamemipemikezomopetez.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/wamuvipeliraloludibizes.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3580c22e9---gewizatamatotubigumewunog.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210831091611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=culture+of+different+countries+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_off0000ef01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 10584 bytes
SHA-256: a46d1614da99ca6ebea0b18b87f00cdda67d84ccb12d31d142132e216b8efcc5
font_01_sfnt_off0001074c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074C 17792 bytes
SHA-256: 33bd6bdc1c938ef928b5ee561df34d189c2da01ab4d2edcc0895d6b1f19466e5
font_02_sfnt_off0001355f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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