Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2b7ff36fc0f478…

MALICIOUS

PDF

65.3 KB Created: 2021-06-15 19:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 99c9053c1e7f887e50a9bb377b6a1b3a SHA-1: 254a241c17d616563bb9216cf3ed639e58ba8fee SHA-256: aa2b7ff36fc0f478fdc1440d8a3b1bdf6e84f5f532295d88b198b498626bdcc1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of a link farm and the use of compromised CMS uploads are common tactics for distributing malicious content or redirecting users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9771

Heuristics 5

  • 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
  • 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://oniceh.ru/uplcv?utm_term=chal+jivi+laiye+full+gujarati+movie+watch+online+free PDF link annotation
    • https://aihr-iadh.org/uploads/FCK_files/file/21517453882.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a779d2ed1e0---35730214159.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608382c62e7da---kozirirewifoponixelerel.pdfIn PDF document text
    • https://2acontractor.it/images/file/24277338585.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/1bc38ed9bcdf1b3cabb28cb9e0208111/42290779321.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608321c8d2313---kevurebekekunavitowo.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/h1ubd17ur2gfkejgj170nm7rnf/5853541511.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608263609edd7---10904258598.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/dk3o0atcjo93if9i2f923hnq06/runujafumaradikaxukew.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/89691860226.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3cd2598a---pidifebitezedobipevu.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/sfgr4fn058mpj9ndnm1m754q8j/73881268734.pdfIn PDF document text
    • https://wsbtitan.com/images/file/16381753976.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/gafosegifeg.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819e0ee9992---pixekutusidel.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/42579349732.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/42101725514.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 5352 bytes
SHA-256: df26d2ac4392a09777d5a38731d655a74b96cee2886071dc8be5c909fec58dfb

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