Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3312dc5eaef9b1d…

MALICIOUS

PDF

84.8 KB Created: 2021-09-10 14:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a9da1458da58eadb45c4821954e655cc SHA-1: 948e98d3e9fd0e9e32cae901d95b0af3848c4aa1 SHA-256: f3312dc5eaef9b1dd27e2fc25d62e6263e086ca088aa5464d4bc4dd3906d8d53
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's designed to trick users into downloading further malicious content. The presence of a visual download button further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://droprint.my/home/ququ4923/public_html/userfiles/file/xoduxadepejof.pdf In PDF document text
    • http://skpizzasubs.com/uploads/files/wekototanomowinanufika.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/gopifavurikazovefagiduv.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/furazetari.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/ginuvakejaxabiguwip.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/cv1qpg236u6h1dju4n7er9ner4/77007261141.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/47153095217.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/94878996502.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/pefukitivanadefetagiga.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613455bbf0cf0---26207969999.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/1962944500.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/zuzof.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/dusowusetaxube.pdfIn PDF document text
    • https://ferropula.hr/files/zojadabejinitupaw.pdfIn PDF document text
    • http://donghotam.com/luutru/files/dawokimurupiwudatexepup.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16131aa60bcc98---62979668217.pdfIn PDF document text
    • http://mousike.it/img_ins/files/90993032135.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/ragoguwuwisix.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/94346128760.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/5786314729.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/zepokopigesibojesog.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/dibuweri.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/61236829150.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/nutejinigasowenepeker.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/nm3hf6e5p9vmiqmafdqd87b356/41564381301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=plinko+master+es+realPDF 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_off0000e29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29C 10364 bytes
SHA-256: 920ae8f168ac28c3f4a30012e93c287a876312824dc141830e06f1b7309eb643
font_01_sfnt_off0000f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 19312 bytes
SHA-256: cfb9cc3f8c7dd54daf9dcc1c57598a8cd83d81ad3a5e955ca753862caa8788d7
font_02_sfnt_off00012d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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