Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dfe73c47c89f933…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 15:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 49e5c3c5fcb3dfcc2675bbb69f7d840f SHA-1: 03341c60871529c4409aead042ac673bee67ab7e SHA-256: 5dfe73c47c89f933ef68a0fd87658c63ff1b900bf9805894729ead667b5948b0
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a visual download button further supports a lure-based attack. ClamAV detection and ML classification strongly indicate malicious intent, likely involving the execution of a second-stage payload via the embedded script.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://synerhu.ru/uplcv?utm_term=gta+5+android+download+no+verify PDF link annotation
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/bigetuvoxebanojebawoloka.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/vemiwemude.pdfIn PDF document text
    • http://swhos.com/upload/files/51356122948.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/guruz.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/5483036375.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/89014158917.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613583b270c05---29356226117.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/duguxiguradikokul.pdfIn PDF document text
    • http://livestocktool.com/d/files/kodul.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/vinevezaxewosakakoxuk.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/paxowi.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ef4f4ebe8---pazokovej.pdfIn PDF document text
    • http://hk-keber.de/images/file/28033647862.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/47375216087.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/4fq6qfsjfsngvvk78qnlet52sl/52269808058.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/bodisedudimavolimemedevi.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/dezuwokow.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/tigavodivenutuxetufop.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/18955575958.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/82238052145.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/96430745635.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/85977495393.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/pivoxikemadad.pdfIn PDF document text
    • 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_off0000dc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 18756 bytes
SHA-256: a25d2819b3d0eee0e9e0be4677e7c961d7524adeedf6ed728fd12e628ec30ea6
font_01_sfnt_off00010cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D5 10616 bytes
SHA-256: 197601a66bb53466fa0fc75db690575346502b7c2d5ba085a9589c0fa5006546

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