Malicious PDF — malware analysis report

Static analysis result for SHA-256 531cb641e43275bb…

MALICIOUS

PDF

87.3 KB Created: 2021-07-15 11:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 96e6b64278727aa0cb7d10310f215608 SHA-1: 0232e237b8f2448730e224b89ce6b3616e3c0de4 SHA-256: 531cb641e43275bb590728ba507a082ce1290a4552f47ab8ad2db23648e964de
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 to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's likely a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa26c8ba8d---vorademurafagiwapupadupe.pdf In PDF document text
    • https://motelandratecuci.ro/userfiles/file/37604626901.pdfIn PDF document text
    • https://baptistfriends.org/media/xinaditoguwud.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/40e6e42cfa4c44577d63e7fd8ac9ee89/xiwelojiwodurebanaluni.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/87959300571.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608b957a64b71---ferir.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609618234fcdb---14801729127.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/bevokopoduvum.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082540132e97---73589510615.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ptbgjoc07b2n271fu7pn0fc1u7/9578969880.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/5b147b0872c0cec46483e9f493e38f64/35299667347.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/femexabotekaperezojili.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/motutupelene.pdfIn PDF document text
    • http://citra.cl/userfiles/file/74012996972.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/ae9e29e23db50a5948a4ae381b97c8e6/56171818312.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/dufudutimurinibube.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021062906334473499.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/sorenelajevira.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/3c8f4a5a6e66cec32a9c2fe2c5bd5d06/malobomivipesoko.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b35f598c48f---lebetudevibuferox.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/60815343847.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/d858nnvggugrfhf6c1ouh5m5mh/muzaxagefisotijomuvudaz.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/sukewudoz.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/27784474648.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/93341805381.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/81030217c98bae28cbdb8d5a4a602993/lovadodujuzofigezoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=plant+vs+animal+cell+divisionPDF 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_off0000f3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEC 10496 bytes
SHA-256: 95ea4f00a4386b3c4b241610184a39b1b72ada7dcaa9abd3b341f53a414c1b39
font_02_sfnt_off000123ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CE 16976 bytes
SHA-256: 4b7c350751a8c67e45fff5e4ee5889f051e1193b5102b3ccd4eaf2a883e5cd36

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