Malicious PDF — malware analysis report

Static analysis result for SHA-256 b955b467330d52a8…

MALICIOUS

PDF

89.4 KB Created: 2021-07-02 19:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3f3eca8f0a82cca4715b2cb5db5161a6 SHA-1: 20520fe3dbc7ab326f47df0578b9c32db62965e5 SHA-256: b955b467330d52a84d5ae8ca724bf3621787be0e8556d2a22832036281bea9aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be non-readable content, suggesting it's not intended for user interaction but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=how+to+draw+a+boat+from+the+front PDF link annotation
    • https://artasedanasingaraja.com/uploadfck/file/masubiwaxufaparamepo.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/26982355775.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/nelagidodamofuz.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/12240002901.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d049a64a54---nuzew.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607996db2a483---34097304753.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/97266653129.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/64217211159.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/pofivipulanot.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b024ce603209b25ce381c8807cb5a89f/57588789874.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c36ce014a66---fawarekorogap.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16087ca762bbcc---pudulegilimefojiwusux.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f7bfdc50c62c4917b0b6aac6fb0a8ad3/goveju.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/72471325342.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/f334004ec242e16e770c549aca3c68ec/tababewajoxi.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609e80bbae1ef---74146754019.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/88515575093.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/galefujife.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/wevepuzuvupu.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/f7bcab525af02c5ca6857f3105018585/feginuduxetamajid.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/3253342784.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/bolebijamukivozafuwudobe.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074015e4d0f4---texonuvijupu.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27b328bd17---18251619519.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/83152422408.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_off0000fa14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 17496 bytes
SHA-256: e82bf4dbe516453080ce6d23b4a963f1d2ed7117d4c1a7140afb46f2cc457afc
font_01_sfnt_off00012814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001402b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1402B 10528 bytes
SHA-256: d68d975ad7ea323f05585e1f09bc0c8f9bcfa00afcd0f9fae53f923830d1939b

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