Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89cc140d94dd8bb…

MALICIOUS

PDF

84.9 KB Created: 2021-06-30 03:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8dae73939f7ed9e3af285c618ede0693 SHA-1: da633ddf676d4feac4c8426ac6f8fcca1ef3fa76 SHA-256: b89cc140d94dd8bb234832e316f888facd19ba365df6cf63fe279b69aaa909a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/13df8162e02e51137bef0db269dbb645/77626643933.pdf In PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a497a93dd---34115378123.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/13260584085.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/evcvlbb8ife52ddv2s6c4h6tjk/16645378819.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/lezasuzisijupudif.pdfIn PDF document text
    • http://toonesk.com/upload/soxemew.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/5ebca43c69c4a79e76e6c23673b5f446/81250705952.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/0mqeobg83foi8lovng1rbocsfc/40057058681.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/72029708722.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/64072418252.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/2876197236.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/4f39a57262a60e9d17efc296e58e4c2a/32014471997.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/bifutulomikugotap.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160944b346cad9---91950225816.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/sonakizajagonilagu.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7129d846b---25627420182.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/adfe1d71feb8d332f1af2054112ef208/saroribolipegefe.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/25771830958.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f6c325a36---sofasedejojuxigugopi.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/pg9qjmh21i82q2n6hgqk3468d6/57403643217.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/a9af1d54d9213c47ed2f4ea7386d52ac/geguxexob.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/peripojat.pdfIn PDF document text
    • http://buildinggodskingdom.com/webcms/file/mupekekekoginifeju.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941f42e9418---tumijurulovapivusuleso.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/7mecs1b67v4fuuuvf39lk0oiq7/40186440777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=draw+a+diagram+of+food+chainPDF 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_off0000eac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D6 16916 bytes
SHA-256: 616ad992b323bcc333dcc9dcb48331bcd8f09ee81f32bc2a6c929836d6966b90
font_02_sfnt_off00012e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E95 10564 bytes
SHA-256: 86e6d23d8cdbe56986b5967308b262ee59bb0681148b20777c4b0a0ebc6e34ca