Malicious PDF — malware analysis report

Static analysis result for SHA-256 e726f5018d97b382…

MALICIOUS

PDF

77.7 KB Created: 2021-09-03 03:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 65ce756a05df27af4ed08a30a265668c SHA-1: 99b5574f341d08900a4668ebe581e2f6deb634ea SHA-256: e726f5018d97b38279bfab4b2ece2c0dd6a53fdd286e7e33adab148022bb3656
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple other PDF files, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://krisoc.ru/uplcv?utm_term=the+splendor+of+islamic+calligraphy+pdf PDF link annotation
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afaaab473bd.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a94ac761b1f---kevux.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/70692462662.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60e82694d5144.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6d0c6229---15135517877.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/jutediramen.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/34516368316.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/jurufefama.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/37611912780.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/8420484d92f989ff44a06971f00363f4/63637535147.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/vafewagekokijorapozolixo.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/11767837493.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c0a77246cdbe2b370096093eebd5b771/52648875184.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/6q58kbqc5374rtgpcdt43m5lp6/wejutojadabukuwato.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4824215382---tamisadoruxofig.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/6972507589.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2f4f66fda---jerivizorutilovijokebaxi.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/27920066251.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd47024ec6---wimolunenubemepur.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/59938093903.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/xawimovawuwupuserujinibig.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9a2c9284c---222762100.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/zegajulevawoxafijelunase.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/97993267295.pdfIn PDF document text
    • http://terrietanaka.com/library/files/13979779831.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/9984240194.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_off0000c8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EA 11044 bytes
SHA-256: 95641aca5545ae669d5c3f01803f1f14690508dd41033cb6ee92c64b1e92712c
font_01_sfnt_off0000e237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE237 17732 bytes
SHA-256: f1b47f093e1fb658bd319084d34e74905338c022c5760d126bf3c6e7d2084573
font_02_sfnt_off0001103c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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