Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a08c2bb75baa9d…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 23:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e1d2f225724b6d084e251b998dd92ed9 SHA-1: 14b8ada6a9e2aea25e9d8bbd62ef45c1d36f60bd SHA-256: 42a08c2bb75baa9d7743283d1a5efa7d2547f1a9c70d3f705aa9a1325c9ef226
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure itself is indicative of a link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://uclerbaklava.com/resources/file/7784097939.pdf In PDF document text
    • http://adria-ex.com/images/blog//file/37557665702.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075318adb278---15958229302.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/8e62fb9f3ee8349c0c7a93f815759675/xaminetadese.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accfcdee6af---mozuvuviniwopanarogolixib.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162819643816710109435.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/44044393934.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/473c828c72c80d7aa48dc3d025a290f3/babesejorejafuwom.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160716241752de---50089773551.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/xodetiliduk.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/14555189086.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/01101f9005f51337fdd24c1197d8fe61/dalopukoni.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/81093213797.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855bf6ac582---fovubixexoliwodu.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/98420561999.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/kuxobaweti.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/28449641014.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/67036276986.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/89873887491.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/77135666495.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/23618976080.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e13d725d1aa---lofinuvutosu.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/noripokovofum.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/likumerajafuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=tkam+dill+character+traitsPDF 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_off0000db8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 17056 bytes
SHA-256: 259c0156f762d41c7277b5d17db6a6a14241c50a4780da873bb510e5a82b5c18
font_01_sfnt_off0001079b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079B 10464 bytes
SHA-256: d583ba5459e005d9317bed9b50f84c67d77a0526c9d8330d505370616c41e1c2
font_02_sfnt_off00011f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1