Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fe19b8891fc288…

MALICIOUS

PDF

70.3 KB Created: 2021-09-03 22:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ff7dc154f06215103e290e1da9d15d25 SHA-1: cc12c9014afd8021d2cd4c6e92539fad445aba0f SHA-256: f4fe19b8891fc288360ab999fee12ec6f32a4ae2da6b8f1c95c31078beeaf269
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or SEO poisoning attack. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://krisoc.ru/uplcv?utm_term=declaration+of+independence+activity+worksheet PDF link annotation
    • http://www.multigacos.com/admin/uploaded/fck/file/20882075770.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/9ec56793f19e539f48e6eb99de1feac0/42714947241.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/xiwijakenuvifebuxipokex.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/biweluvudatul.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160fec0e63b2d1---wimazur.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/edshvvfd0sdc2h4celj6b1j31t/13155834607.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/2198175061.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/nopovanu.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/43627355614.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/22361598545.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160df1c21e1ecd---viwefemeditupab.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608080445deac---27472219116.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/n8678cb7f40m66ib8nctd8i2l3/98884865463.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/40771224114.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/pibemubovifewodo.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612e5739bbac0---72814157374.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/3qdj7lvjao2al24blgt5unspap/demarizumodukanegototofi.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a961cca5877---99226001763.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/baxepidulejo.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/86427877583.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ac5d892381524618976566aced0317c5/17381775962.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/wokebenunopolobi.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/31925386004.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/oi835lm322ibjs7la1uod8dr4h/26722699090.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/cbe1307963db3c0b9f9c45cd53018503/xudepakewopomalonavat.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_off0000b59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB4 11076 bytes
SHA-256: 8132bab075d918fb985e7a3192faf327488766139a4bd9828207c72e29b7aba7
font_02_sfnt_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 14360 bytes
SHA-256: 3ba35a128bb73bb2258a05814f9ca5958633c5879dd68e0af9e8f1d285f1f4e9

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