Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9432725c7c7c4fb…

MALICIOUS

PDF

71.9 KB Created: 2021-10-06 08:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1118d60c487e6a529da9f24702a4cdde SHA-1: ece284f7887897bde484f065f4837f52fc04f3ba SHA-256: b9432725c7c7c4fb9d3c8445fc52599e4f8dd7a971231332df62478c09c3892e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=how+to+sign+communicate+in+asl PDF link annotation
    • https://unaizahic.com/Files/files/rozenuzafalepezowulubefo.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16150e66a35e48---26941198771.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/70758862546.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1777ddad3---3346262157.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/zidajafofod.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/peradetevinojuzapig.pdfIn PDF document text
    • https://grouptm2.com/contents/files/koloxakedodiwozidun.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/vozobarapojuju.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/68102062943.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20211004053154.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/jovuzazadelutozorowuz.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/labeditozeg.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/49360201054.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/dv53r4s4n83r07g6pnv86j6tud/94627880715.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/11458074351.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/58597d4023f01718824436783ac5d75d/90494074804.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/67296464845.pdfIn PDF document text
    • https://bursac.net/userfiles/file/tujadomobakizunixape.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/30389625856.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/mekipabuxuxobepo.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/kikiwase.pdfIn PDF document text
    • http://wuchem.com/upload/files/81132208138.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/nirevewegaxofiniraxituz.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_off0000b828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB828 16176 bytes
SHA-256: a08b5a68327f01793bf99d1abdf146371ab160562846564ddbf210117722da6b
font_01_sfnt_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 10652 bytes
SHA-256: 3cdfbfd335e57b2f024bd8da18b30d6e5742fa5256b144fdeb8ae2beb45fe11e
font_02_sfnt_off0000fa2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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