Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d124d832c2738de…

MALICIOUS

PDF

66.7 KB Created: 2021-05-04 14:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ead4f573a8524a72c668e39ecd9f850e SHA-1: 4bac2908010c9d02cf6d60c61271b74b9ef12929 SHA-256: 5d124d832c2738de32bbda7ba6e5fbc5a5f619ddd65ee1e9d54d7f686cdca32a
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious sites. The document body contains garbled text, indicating it is not intended for human readability but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9530

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://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/7a74f23b9c420f149ea2dc2c5f7786be/purila.pdf
    • http://ankaser.com/userfiles/file/31957155215.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/e6d860de2cf1ac97dca717b33e0bd337/21189986068.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bce69d6f32---99576517606.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160836060a93eb---6854010437.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1607e484f3664a---rugomolisofezatavur.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e84c672f9ef2c6d0ba63547e0bc4fbe/pumivo.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/80e3fbc843f7dc28798daefb54104efe/79027555957.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160742dbc50cf5---rigujigubakirik.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/e34fe6bac684e72dce1fd263b65a1260/zesewafobebibegulat.pdf
    • https://motelandratecuci.ro/userfiles/file/mujowupivapames.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/u60ailhcv5k4qd74fgl4oheg64/gugenomedes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=vmware+esxi+6++iso+hp
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d195.bin
f289fe6210fdb8e444b85031d10efd05247a7b2acf9c891989dcb03e5790abc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD195 5304 bytes
font_01_sfnt_off0000e389.bin
5e444a65edc585d229974c75481149d216e72ccf4dc0c314e075369cffd986ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 10456 bytes

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