Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b62be3d1fc84dfc…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 05:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5e3088d6bc786ada51d7be1071063a12 SHA-1: e61f9c590b92497ce47ae5dc4ffae9b05fad40f7 SHA-256: 6b62be3d1fc84dfc0615f7572788da92ad3ecc2c0541bb4352b3a9be7f765b65
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external links, many hosted on disposable domains or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://archism.ru/uplcv?utm_term=watch+black+panther+online+free+123 PDF link annotation
    • http://kerekesvillszer.hu/UserFiles/file/20970980156.pdfIn PDF document text
    • http://knipia.com/userfiles/file/veradomute.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/nokijejaruzubesel.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/32852771545.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/rugoxabolo.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/9671756642.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/vorigix.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/57655506544.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/xubaxavebakotekafal.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/35415268577.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/begelulipineremeku.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/bewomovimofodesodenilus.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/45538549524.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/38654302691.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/69636504920.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/vegadudorabukadu.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/nubikijonibep.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/2932890799.pdfIn PDF document text
    • https://heureka-cz.eu/files/xibuxizorirofemalaj.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/ruwolisemikizawupebigatim.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/10951851770.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/33217735015.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/e2a555706e7c492fa3173c6cdf7177b3/kiliveselunu.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb6e536737---nulufefasu.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/df190421b84277eca12b8d3f230bf123/71491567652.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/fidaxadi.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_off0000dfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CB 10980 bytes
SHA-256: 2798e0ecb339b90a4907bb693e31e59b3902e4c107a08f8a024a11ccbfe6067b
font_02_sfnt_off0001111b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111B 18304 bytes
SHA-256: 6121c56fafb95ba0f02486d0e7a37cf3d72fc1f1c97b6cc3572b6131aec9b999

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