Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e625795fc24aa6…

MALICIOUS

PDF

85.7 KB Created: 2021-09-13 05:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d06b7affc486c3012ce2e5ec860f230 SHA-1: bc0b59a857bf60f60d09a88f173241812ea0e127 SHA-256: 61e625795fc24aa6ac0e9bcfcad059d5c8222786e4aaccec642f3e91b1519ed6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=god+of+war+modi PDF link annotation
    • https://fizjolech.pl/userfiles/file/62938926913.pdfIn PDF document text
    • http://hak-al.com/resimler/files/25726966229.pdfIn PDF document text
    • http://masonhn.com/d/files/mabedatalukiketusebubev.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/jafodaduvupiteguwokujurem.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/dibobojatasofo.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/13250988142.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/49407910953.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/jajuxaxowuvalo.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/31411577637.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/tefofili.pdfIn PDF document text
    • http://sinoorchids.com/image/file/vitel.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/13727587417.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326eedc1cda---20868629032.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/91752034848.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/sifonobemo.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/buxojipuveb.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/ximeresufosabarijeno.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/60144160659.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/vagugo.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/pufufamupusogow.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/9525267362.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/37713901844.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fa86a1bed---19388318733.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/boxukisuzekoxigenalovibe.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/dsllqg92gncgn42bhkos74n0rk/23402100811.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/sitilowosi.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_off0000e962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE962 19164 bytes
SHA-256: dc2901a103ad2a1d14b27d53740c3d2c1cf6f5faea865478c35af089cb5eb667
font_01_sfnt_off00011b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 10092 bytes
SHA-256: 02ed8cd1252ccadb08e40f3f59af1cc182012f3926f096eb497e629331fceb7d
font_02_sfnt_off000131b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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