Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21e51ef94ccd354…

MALICIOUS

PDF

73.0 KB Created: 2021-10-02 14:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 355f48c3391b3dc8afc35880223ac3c1 SHA-1: 76eb6ed20faa9cdccf6d1da6e2b638b3a2e0457a SHA-256: b21e51ef94ccd354744f9e2074276d75d6d0e6dc96021368d9bbda2b7be87987
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://queure.ru/uplcv?utm_term=pavement+design+and+highway+construction+book+pdf PDF link annotation
    • https://tractorpulling-emmeloord.nl/upload/file/gogozajumaku.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/gofevokibebanisubov.pdfIn PDF document text
    • http://panova-art.com/files/file/poxitaxejejig.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/sugokipojililanupivaxode.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/60398556134d285e0d93.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/43918199348.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/taxasozajerizex.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/takanawisakopezopogugipa.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/modezinevoguxewewezin.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b37683702c---39574704076.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210909003029.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3c8dcb051---48032510159.pdfIn PDF document text
    • https://pellevah.com/upload/files/tajek.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16153c161600b3---gozata.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kegawigabezoteviweneg.pdfIn PDF document text
    • https://kimcert.com/E/file/45363818227.pdfIn PDF document text
    • https://wildnaturetravel.com/File/zuwowosudam.pdfIn PDF document text
    • http://nprofit.hk/userfiles/73235376133.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/nifoponinofawijizip.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/09a08b8d7a4e1b4fda76230228a392ee/1540687523.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///88443106446.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/kitesabelat.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/malewegedafelixuxozosejok.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613396b03fdd1.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613394e01cc0a---mubudesajitivirav.pdfIn PDF document text
    • http://prograsifkalip.com/files/45175497442.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_off0000b623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3A 11620 bytes
SHA-256: 44a38418bf769a915a03aa9975ba071c6f936ad87ee9250ddb32ae172c956a5e
font_02_sfnt_off0000e950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE950 17680 bytes
SHA-256: d20f31991a504def59471ae5b3ea5e03b426ca670c420cfa44817ea96d5d89c8

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