Malicious PDF — malware analysis report

Static analysis result for SHA-256 3871dfffe4a456e7…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 04:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 300acb15834b2288ae5d44fcb154eb50 SHA-1: 4855f5428ecd28a762d1ae529b9008788e6226de SHA-256: 3871dfffe4a456e7cc614e8f8d3cbd9f02aedbbf28166b6c2662841fb8953602
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs pointing to compromised WordPress uploads and link farms on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/6oagt643dp0eeik225j2tj8rmu/62461426436.pdf In PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/mugup.pdfIn PDF document text
    • http://szpk.hu/_user/file/welapowowubo.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7d1771c60---44255143050.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/rimeguxupuwu.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/81423918791.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/wividitugevopewezavo.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/lipurulazukej.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/mafizakenoxulunipupakage.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/lonuwuxab.pdfIn PDF document text
    • http://skia22.ru/pic/file/75587539008.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/29055301655.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/jokamalatijavovi.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/kerojolasaseroxuteb.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16133646d205a1---nowireridodidurakiluso.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/90817102415.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/1496709763.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/dumifudopefonug.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/padeda.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/73321193879.pdfIn PDF document text
    • https://kermanrooz.com/img/files/rizelopoxoruvokobumitami.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/cad905d3f45befe394aacbceee432c33/62120709461.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/31429429684.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138efe8142d3---53820242124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=android+browser+batteryPDF 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_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 17124 bytes
SHA-256: 3b43fa793e919991d624a4cd004487e633ce71d4987b46181cb3897827312e46
font_01_sfnt_off0001072e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F45 10516 bytes
SHA-256: b3b41626d325132a89564bb676d89fad00bceb13b3618454cf1706bf11688471

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