Malicious PDF — malware analysis report

Static analysis result for SHA-256 8750ecad58974b3b…

MALICIOUS

PDF

97.4 KB Created: 2021-07-01 12:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69ec49cb3c0733ce4a8865c9f6af258a SHA-1: c171737b91bfcaa5cbfed10582f7b726bf774fce SHA-256: 8750ecad58974b3b03abb2bffb22c9f19f4386e2fd76cb478e00b6f65c76efed
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://am-assets.com/aom/magnolia/userfiles/file/wawupibojorem.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e36f88ebff---zovogujewubonirizo.pdf
    • http://armanetti.com/images/42635982340.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31cbbbbc3b---74494005975.pdf
    • http://bygreenpure.com/userfiles/file/16574465335.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/cd93273bb8f0fde2da2fce78ec342b32/lawamupekoluleburaso.pdf
    • http://grandrosso.com/js/upload/files/33897490223.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/6a71c7e9f698c6cc4c3ec1fee644d256/gagolojuk.pdf
    • http://gianphoiduyloimodel.com/Images_upload/files/satagararabepexum.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c573e1692e---xugod.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/8eeecb15a2252682419f9c62ee6b4fc7/84341308746.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/5mro6jur5f173jufqg7tbqgono/25211532008.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa64b89c97---fadajesikazodorixivupabu.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb788882064---5889560383.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/2a31a6fa436fb0de43fd3c01dc47b733/28345715214.pdf
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/64495318748.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dd805ca3f3b---44696922814.pdf
    • http://banghaija.com/userfiles/file/feranosoborowozuxe.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0e432ba06---28935491244.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f918e102cb---dotivaxijedabadigulokisum.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609832e21e850---70435390432.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160897877e64b1---fapijesunixapunifok.pdf
    • https://maconlux.lu/userfiles/files/liboruruvalen.pdf
    • http://volamtuyetthe.com/userfiles/file/buxoratodipupalimupobapu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=battle+for+dream+island+rocky
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1E 16792 bytes
font_01_sfnt_off00013330.bin
5868a12fbf7f13b2224d77436a1e4eefa67da5261d7a933db0b613550365721a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13330 16888 bytes
font_02_sfnt_off00015f33.bin
5e7dabd49f35fe527b4c3562a82402caf021a4f551f01a428de7028be8219f29
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F33 10896 bytes