Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcbfbca16d9de416…

MALICIOUS

PDF

76.6 KB Created: 2021-09-03 18:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 00fdc4be228dbf29bc6a529f0b1f661c SHA-1: 04265341e119f96e9af180bbcf8af3915e9937d2 SHA-256: fcbfbca16d9de416c9052afe9fffbb3480b4d7cb085b79dfbe12807733e2c512
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The file's structure and URL distribution align with techniques used to obscure the true destination and evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.asap-recruitment.net/upload/file/berefimero.pdf In PDF document text
    • https://leganordavigliana.com/uploads/file/58835342311.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/wunumoxemafav.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/jaxibogalo.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f6f112ba9---nojifor.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16092ee4f336c0---7027050277.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/vebanadenepekefe.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/91gf8upva8ldutgf892c78nqhs/33998821295.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/25739825305.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/merufat.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-8-24/20210824094221943886.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16110bb964d82f---juwejakofa.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/gevurutunegenegem.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2d556ca50---gunixofunadivinipu.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/viwilukavata.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/1q7gh9b4n8td6a44d5sd7qcou1/16978084437.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/nolesawetegokanatanosix.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/27mtknrpaegpq9eslru5ujsmn5/xokafakisikemoz.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/gifiki.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/43734610703.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/sobiserizebesokudowuvixik.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/rejizidenaroxuwepugox.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/filefokexizuvilamadad.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/zajidufeloduzinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=u+p+board+class+10+english+grammar+book+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_off0000c1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C5 11384 bytes
SHA-256: 6034faedeea256f7cbeb01ef2ff76ed93f1f06fe34a0684bd887ab214d942167
font_01_sfnt_off0000dbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 18564 bytes
SHA-256: e4e0484a93b37f69a70154de0127e5f98e59c7efbcd4de3c59d53fc09e545906