Malicious PDF — malware analysis report

Static analysis result for SHA-256 881cc30be9c34ff6…

MALICIOUS

PDF

109.0 KB Created: 2021-07-04 21:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76ab23dc6f3298898954b80712144e1c SHA-1: 52dd85c3391f2bb9ca4d3acd91c5b90f246345c8 SHA-256: 881cc30be9c34ff6d0dc8471895def903a1564c4cf57bb93da30687fea47621f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the suspicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607626e251e66---61664661250.pdf In PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772483035c1---pozisifogumakazoxuf.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/03f46ed8361f4cdc7f552a1dcda8faa9/15102353756.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16099e1d278c92---27394694600.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/88927117632.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/rolonusir.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/11809368654.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e66f2f797---18319428056.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa7c901a9---18663988247.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/72202879612.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/730de26ffe7e7fa020d2e661251af5b0/86427916344.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/5f6df591bdb2826412f125546aa04157/83301596705.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080746240357---gebozurofegabonokelikiwo.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/96239027343.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/83275653489.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/wukanetu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/30829783345.pdfIn PDF document text
    • http://apcmagon.com/userfiles/26015227045.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/demubagozilo.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a198916b4---tavujivi.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/nunoremaniz.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609032ec7e21c---66167039369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+hack+into+snapPDF 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_off00014812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14812 18128 bytes
SHA-256: 6eb351bc593db5c2a55e959159d25f11bfe4d5d0e77e1300c29aecf1f02f0241
font_01_sfnt_off00017726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F3D 10364 bytes
SHA-256: dcb110662dd2715740d53ef2fccfc4a5021831eec811bb7f1bf47aff055e7005

Open this report in the interactive analyzer, or submit your own file for analysis.