Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac4c4d814dedfe4…

MALICIOUS

PDF

87.6 KB Created: 2021-08-29 09:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 815e4e3f393706766cf4a921e37d3334 SHA-1: 9af9665278b95cc14f44af13bd9cdfea8dfd91a0 SHA-256: 3ac4c4d814dedfe42d2c82ae88be17a965f7b557873569626434a7a066994a8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The document functions as a link farm, directing users to numerous unknown and potentially compromised websites, which is a common tactic for phishing or distributing further malware. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://omg50yrs.com/clients/6/6d/6dc66c997efb3e4e8ce6e6e7d0694e91/File/zufijanabu.pdf In PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ce7a00d47---82570421318.pdfIn PDF document text
    • http://royalproductsonline.com/userfiles/file/moforemufixabujovose.pdfIn PDF document text
    • http://marymo.ru/uploads/files/supurabudawefolemuv.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/e18cd4d5aa6d9487eff1df0f763b2edd/merimanuso.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/m6vg1ia9e9n63104sqgfatlcs0/begipidorofat.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/69782672673.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/donotodubagejafurifudo.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/alizodikodikopuzitur.pdfIn PDF document text
    • http://wwstationery.com/files/file/fesuzikisakamura.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/3c483ae2c878ed7f1dc6bb43396a9826/20924100751.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/33418809531.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/nikemejuxarevufurot.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202108/file/samofagiwatojibo.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d15de31799---68295191848.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a632716b116---wilozotunisoli.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d04b4d8d509---sorumuminol.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/29524747015.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/lavajokugikobuganekevej.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f20f2983976---rujovamupu.pdfIn PDF document text
    • https://2acontractor.it/images/file/wovoboz.pdfIn PDF document text
    • http://446888.top/userfiles/file/didivo.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4d5f9b8e7---lelorinapixutubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pioneer+woman+ham+and+bean+soupPDF 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_off0000eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C1 17860 bytes
SHA-256: cce40a887dc5466e99d4b23e75be0ed27c11ec76f5966fed8cdbd1f57b0bf06c
font_02_sfnt_off00013509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13509 10840 bytes
SHA-256: f313fd1db99ab188dd288919581ee26a233be37d2d4ead88066180075acd8355

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