Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe48343488cde60…

MALICIOUS

PDF

75.7 KB Created: 2021-09-10 14:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 043b05004261a45b95a8cc0dceab3e5e SHA-1: 5f67494190ebc4bc35b8a0049934205cff77eb27 SHA-256: dbe48343488cde607dbb56f3da73706b9df588487be396ab5f98f3a9217723e2
172 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers. It contains embedded JavaScript and a link farm pointing to external PDF documents, some hosted on compromised WordPress sites. The presence of a 'download button' lure suggests an attempt to trick users into downloading further malicious content, likely leading to a phishing or trojanized payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://safedoorsystems.com/cmsimages/file/xesuruzo.pdf In PDF document text
    • http://hatowo.com/app/webroot/uploads/files/mefunaposunilew.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/63837455735.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/95200018337.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/20679235308.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/titotovokabajajomis.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebabaa8ca5---28828887490.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/jimupuxizixezigazib.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/todidebe.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/69280117197.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/90939344115.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/ruwupujisavufenezaxivaz.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/nejudane.pdfIn PDF document text
    • http://hflchw.com/upload/file/86855043922.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202194153133227.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/60658343460.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/vutmg74ok35hfa853hkvpfgv1q/vunop.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138868339f63---wozizukilexovijumu.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/25938131539.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/pumubuzirelik.pdfIn PDF document text
    • http://ropesadventure.com/d/files/guxuxukiligegudosepojoj.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/resumamasogeresemiju.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/98251148024.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/defabunexetejineke.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/14886066618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=modern+sniper+android+1PDF 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_off0000c3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B2 10284 bytes
SHA-256: b751b62cdb2b2868a459aef2c445b49db8d4643dc438d844ef38d360140a9199
font_01_sfnt_off0000daf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF1 17656 bytes
SHA-256: f0ecdee1ebaccd28360df37554268a33207a6b4b0a62f32ca7c7b07027c591fe
font_02_sfnt_off000108de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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