Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e728b345ce88abe…

MALICIOUS

PDF

79.1 KB Created: 2021-06-07 04:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83b3205c1bc0d548bf629bbb491add42 SHA-1: 0001ef5f60a6f5603e62d313e1d352b225f0b6b8 SHA-256: 5e728b345ce88abebde70c911b1b39815d8b6611015a2321df2c328d32aa6e4d
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised websites, suggesting it is part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads. The document body, though heavily obfuscated, contains keywords related to software installation, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://synerhu.ru/uplcv?utm_term=sap+hana+studio+installation+steps
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098fb7dda919---88827420142.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d6c02f8c1---56401242824.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099543d56003---44211249909.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/b4b7fa5aa7c5ef6d61d968528b100def/33358630600.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27e3d4bcd7---4413737027.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd8016cb2f---23301213384.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nazodolafogexolivikezekuk.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b4276213ce7370c03f14440a34dfdfea/9004875830.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d82b4c92731dfacbe027df0d1753db1d/bukafukajometupim.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3d439115d---wakipoguw.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/25b6476f0c622466da57f5777f0ac1b0/51372970933.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e9a1290af---xupasonas.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16073a982c5589---90097792652.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6363e6feef6e83f24bfc6db6cb593519/lezemexadogipotizaf.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ed63683c6---43952438895.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • 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_off0000e306.bin
9800d23cbe684d6e8e0c571827a0d42922af74c1670de4a6a6c5a01011b3f9c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE306 5056 bytes
font_01_sfnt_off0000f434.bin
59fc038b442226dcd02bc3558e18407509907df52b765b295a1049a3ad74339e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF434 10980 bytes
font_02_sfnt_off000119b1.bin
b1a23c0d5abddb3c1fa783dae95ab2d69a7452c8e76b6ebd072e213f69964d98
pdf-font-stream PDF embedded font (sfnt) at offset 0x119B1 16288 bytes