Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb1ac3aa3f0e5d6…

MALICIOUS

PDF

75.4 KB Created: 2021-08-08 23:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84a31cb2380bcb5dfc5ef820e8ea8b8c SHA-1: b09278131e80e175f3c8a40d61dbe037e9201b8e SHA-256: bbb1ac3aa3f0e5d6d19a1aba908c742f923e6b5bcbda5ae92733c1c5116e2656
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of multiple links pointing to compromised WordPress sites and disposable hosting suggests a link farm designed to obscure the final destination, likely a phishing page or malware download server.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6658

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.
  • 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
  • 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://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/2f6908f7f609722710e2609fecce7353/pikapem.pdf In PDF document text
    • http://irk-yoga.ru/upload/files/97286364926.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/32620828341.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/85467822174.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/favizidoniv.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075eb2bed4d0---48421203319.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e0fc863b8---voxiji.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160981b106c413---pexoxuwoxalakow.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/hp76svuq4ep7q7ilrjsk228lju/kenobomogopawog.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b31e5ea60261ce2b814dc4b6eeae72ff/xilejipolopunodako.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072e77a82be4---rodumuba.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/lajiduzogew.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuzititevafe.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/94241532965.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/pixelajeludi.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1ed79ebb2---13801408535.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/pofelapuverinegeris.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/newuvowosamu.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/bedepevufagibojigubaninod.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/51444633027.pdfIn PDF document text
    • http://xenangheli.vn/public/files/66174989209.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f1018af41---jusapimesi.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/15461574944.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/97554148396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pluralidade+dos+mundos+habitados+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BD 18656 bytes
SHA-256: e9a3c9363cce4d29d56f33f1f19e0307cec43d59228a5536ee06bf81b2b3f9e0
font_01_sfnt_off000105df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1