Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5cf693240f45bf…

MALICIOUS

PDF

102.5 KB Created: 2021-09-01 16:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 006f1fc16e5abedfa2a63f8afd0002eb SHA-1: 0d9c118bad448d04de20c15066cf677d1cfc20b0 SHA-256: bb5cf693240f45bf0e0d6f4f18679d609d199498c0a937dcb27e2476a72f2cc8
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised or disposable hosting, indicating a malicious intent to redirect users. The heuristic 'SE_INVOICE_LURE' suggests a phishing pretext. The embedded JavaScript likely serves to execute malicious actions or further redirect the user, contributing to the overall phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://abpaluso.com/upload/file/vakewipumezujebafukux.pdf In PDF document text
    • https://arerp.kr/data/file///14380817269.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/70760057868.pdfIn PDF document text
    • http://asfalon.com/__files/file/pagewa.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cbebb445c---11683815573.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210713215820.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/61478960232.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/11003066209.pdfIn PDF document text
    • https://fong-cai.com/upload/files/pujudasedekaxixutiwisel.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/766e3d0ceb475c64a1190bf884ba541b/toxewadirigulosekutagiri.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/81531270173.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/dinovug.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/rfes42f6qvhb13gfe8uh4cgv35/20304066622.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/22559506777.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e895f093e---dasasurafosaf.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/fisekuvogebivema.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/xaxopapuk.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/rimadapewuzilubawe.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/19207272815.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/japevalumipevalozelemivav.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/41834553848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=probability+riddles+with+answersPDF 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_off0001292d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292D 10684 bytes
SHA-256: 643a2a3e1ae2cfb9a52dcac51255cd38b9f7872f9768bf8e9ad65f54114b0210
font_01_sfnt_off000141ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C0 19092 bytes
SHA-256: c8893c30f4692e5026b40e71020acd57bc9d43e983ae1058f7949d84b327b041

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