Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ed47dc25cea9d0…

MALICIOUS

PDF

70.6 KB Created: 2021-09-13 21:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bceb401d853b341288e28dd4f7c800c8 SHA-1: 6b635c9b69536956dabe31673b05ee18e6a4bead SHA-256: d4ed47dc25cea9d0e0e809ece745196afd32b6ea5313fabe8fb339e784d96381
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 WordPress sites and disposable hosting, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The file's structure and numerous external links align with techniques used to obscure the true destination and evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://yidaig.com/uploadfile/file/20210913061432.pdf In PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/1905d1dc9710c7f7b29be4326bf42f17/vifisanagekefinexeguruvaf.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/mivuvudewuketodurizofuj.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/63639879084.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16139e6228c281---98884946537.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///19941178876.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161327e29cc0d6---lazalipepisiruzabuf.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/901ee66c8af8c964c4a7c96705ee4390/42941927910.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/fozemekaji.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9b70ac08444d71e5e3de1ea864f8d8eb/xukutizidu.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/0cde09f6755a1dc49a6ac0244ff9831b/62676986127.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/49281069035.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/48226192877.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/39140828497.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/xijiv.pdfIn PDF document text
    • http://industrialdevices.in/uploads/80708428959.pdfIn PDF document text
    • http://cartopack.be/Images/file/76567757490.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/makanojebaterejova.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/7d5544fdbdb6308c26179d7dd2561574/wejisam.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/59043779778.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/64756264978.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/jevuda.pdfIn PDF document text
    • http://centronegozi.com/public/rumorunirejijerabosal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=wps+wpa+tester+premium+apk+free+download+latest+versionPDF 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_off0000b437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB437 10996 bytes
SHA-256: bce0265224f51a090bccf3fac2d3f0b0871262945cbaf929997fc5c9b9925509
font_01_sfnt_off0000cdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD0 14996 bytes
SHA-256: b121b1b875ece9190ba1fa7ec6651dbc33eb7610e00480de3de63fb3021426a5
font_02_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1