Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbdd730bf72fa995…

MALICIOUS

PDF

75.8 KB Created: 2021-07-03 00:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 834adb9fd6eb8a487868ce1ab4f8854c SHA-1: 603c973d5c13f2444a72a5b6256a707a05530b64 SHA-256: fbdd730bf72fa99594ac39dfe42aa2140e89acd7c973963914e24f581414ef57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute phishing content or malware. The PDF structure itself does not contain readable content, but the presence of numerous external links indicates a redirection mechanism, likely to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc97e43f24---wetunig.pdf In PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/8727918328.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/dafijevexipurezavugino.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0722989bb---zujudi.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d75a851757e---29008112853.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/pikeruponiturutuf.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/dujigomazijopomozi.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4892d9127---83323933423.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/69052113336.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c55e9644e---wikotatoxeruroxezebo.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160909ee982510---rovanoxetojawu.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/00e64f1f5e1748c1e03ba28d70d85c15/figukife.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/nipibuxumirisunij.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/5933b88ac3abf7c271fa2bd56a87a967/14239138951.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42944e0e62---81076790033.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/poxitedolowesaxafika.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6eddd9b6a---xogomarutofevokerutokunib.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079842028ff6---nofidavezi.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc99a0e38d---fewedotawezap.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6024b4e40---19982644374.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/76454875875.pdfIn PDF document text
    • http://inistor.com/ufiles/files/26935754838.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/2db53fd3ace4cdb27de2b598f590448e/18261661042.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/nuzabiz.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075f4801fd55---tixumu.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0470075a7---95143635577.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/0pp1isjf8fmd5njjhobfdfri5m/xazaxakedotanekakoxudul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=wrong+turn+6+torrent+downloadPDF 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_off0000c3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEF 17396 bytes
SHA-256: 6d57d0758243eec0c90ea5683be6395e310ad84b771dfc85608d2b6440f1aa06
font_02_sfnt_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 10508 bytes
SHA-256: fd52268bf8a062ea5354a3aec84546d1620e9c2bac60d613001a01b1a4db8ed9

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