Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff08ec2ca2e0731…

MALICIOUS

PDF

75.2 KB Created: 2021-09-11 04:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6783b759e258e9ea858aec7edb0a4fe3 SHA-1: ca8e98a173b754099984909bcf74a1ff5612da4c SHA-256: eff08ec2ca2e07319e828f1c2619589e3fabcf8d63ae495e1615717ea69781a3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and a phishing trojan. The ML classifier and ClamAV detection strongly indicate malicious intent. The file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, suggesting an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://gps-ambroisie.com/ressource/site-image/files/nedudusemitosabomivijag.pdf In PDF document text
    • http://cioccolatogallucci.it/userfiles/file/virizo.pdfIn PDF document text
    • https://ever-progress.com/upload/files/gaxorad.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7a397664---55745143022.pdfIn PDF document text
    • http://kaitianjinghua.cn/admin/userfiles/file/202109031524174949.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/rupem.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/nobalusevoworoxudilitez.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/dunafixajezomilapefu.pdfIn PDF document text
    • http://santeh.md/img/files/dawevowesawemo.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/38573381431.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/segazobijetaguvunuveju.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/1499596373.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/kepuzunidelidozapaxumuxed.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/48688d822970f310d5264095848ed710/75498983654.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/fm72vrukfor03t7i7o840cbrr6/fuzunuguxef.pdfIn PDF document text
    • http://philipsphotographystudio.com/zubus.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/mutasi.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/ludavugefitadiruroxetige.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/gazol.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/4o0g9fvpommd4dl40larrdtc75/18713580283.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea81c229fb---damuvifonakovu.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/tetazibejalupawuko.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/81954643427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=coin+master+spin+cheatPDF 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_off0000bacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E6 10624 bytes
SHA-256: f00624b6e3ef23355e16afed1f05a95a42c7c31ff8c9709e1f33e4dcc82bcf08
font_02_sfnt_off0000eb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 20160 bytes
SHA-256: 072748a85c2c16a4500683e3ce1cbf9158b2bb6aeca028706cf7fa116477720f

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