Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2bce9b18596c30…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 17:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a8e00842e5263d6eebb5623435c8e12a SHA-1: 8d9217bf2f0317b1ef08f65bb537fed9a537c014 SHA-256: 1b2bce9b18596c30dabcaf48a3fa72c384657f0a4371f4b729eff054f5b54d16
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, characteristic of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://astoraccessories.com/uploads/ckfinder/files/13054974140.pdf In PDF document text
    • https://afritransport.com/app/webroot/files/file/wirekalivuvunawokeloz.pdfIn PDF document text
    • http://slovoveri.org/userfiles/dimiwelebujuvamuwuxasub.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/65738885225.pdfIn PDF document text
    • http://awards.nl/img/cms/file/rimewezizajola.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109140406033891.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/leviwamiwupurikubawof.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161442e938071c---miwezujuzi.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/fepofa.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141521433be0---lupexerevedosabo.pdfIn PDF document text
    • http://edituj.cz/res/file/meles.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/lukoderadop.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/rutuziju.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/0ck84ua2t46vf1bfk3m3dbrta0/64590467584.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/vilegemejajot.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/1111a07faaf6f3f8148582e80f723f33/10373150516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=super+mario+world+3ds+romPDF link annotation
    • 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_off0000e413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE413 10784 bytes
SHA-256: 0506c9ca288f810118c9249a5877da3b2bafbd24fcda0d28498ee7ba28c2b0ea
font_01_sfnt_off0000fced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCED 18336 bytes
SHA-256: a37a75e75a71f1b86c41f190a33e3597fb9e4f108b26dda0995ae8eb41974222
font_02_sfnt_off00012cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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