Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1c419b319eac72…

MALICIOUS

PDF

86.8 KB Created: 2021-06-25 14:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2470f65368839fa5d36530cf44a6184b SHA-1: 31b1c88f1eb7c796ee4cafecb1699bfb0f9de5ff SHA-256: 5f1c419b319eac721a9a5ea8ce972de764d1605ab5e1b206695ab425f9c51ef7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF likely exploiting vulnerabilities or serving as a lure to malicious content hosted on these compromised domains. The presence of multiple external URIs and link farms suggests an effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=stand+by+me+you
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/ce65c5ad7d0b38b301ab722eb667efcf/nopirux.pdf
    • http://asja-doll.ru/userfiles/file/46837429714.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c25e29534---58607905982.pdf
    • http://kaizenlife.com/ckfinder/userfiles/files/buxir.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076c8069d26e---8091756029.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/78803a6fa574707e04415a092258eae9/19942273290.pdf
    • https://office-agglo-larochelle.fr/userfiles/file/zisofajikedaripevisa.pdf
    • http://snap-drone.com/userfiles/file/88423227962.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/j34d8dspgdvo715e6ohlmpaaic/30344681879.pdf
    • http://centroolosprato.it/userfiles/files/58128862194.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e6e6648d9---75210933837.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/5e100b975e7971bf1a22758cc8a7f903/vabusowigubonananos.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/5e7923fdb5b3ac78972ba8fc05c1673f/wodixoloba.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ad047d48e---bagoxera.pdf
    • 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_off0000f2b9.bin
5d5d732835b7cad25c5a58e63d8c6b684022b0d5c45aebe510b59e2155b5763e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 16956 bytes
font_01_sfnt_off00011f02.bin
5d202fa937f7ab4e59604688ad07f5d8947954c3c860d31841cdc74fa7244c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F02 10432 bytes
font_02_sfnt_off000136b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136B1 16792 bytes

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