Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa36954c3555909…

MALICIOUS

PDF

74.8 KB Created: 2021-09-10 04:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f9a8a46f18c3980b31cf80a6b20268c SHA-1: bb00bb9984ed67d91b648855b56aac64b119dbc8 SHA-256: 7fa36954c35559097b26588ec87fe14eed61195e5894ccaf53d079a2ea1a8652
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, suggesting it may exploit vulnerabilities or host malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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://queure.ru/uplcv?utm_term=best+camera+app+for+android+like+iphone
    • http://www.jindatunnel.com/up_files/file/negilipirimijazimawek.pdf
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/lilikigutajuwutifupinajez.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138507204388---botexexokomuwut.pdf
    • http://autoset66.ru/admin/ckfinder/userfiles/files/jusur.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/32gi9gun29gtf4jvj08o95dl81/jutufirer.pdf
    • http://schodylux.pl/userfiles/file/42806066400.pdf
    • http://gpszone.hu/upload/userfiles/file/sinowewifu.pdf
    • http://nt-module.ru/ckfinder/userfiles/files/ximoxorotobaxitowotap.pdf
    • http://seattlebestteriyaki.com/uploads/files/bidiwulujenos.pdf
    • http://weddingdove.tw/uploads/files/202109010707591229.pdf
    • http://dh-cell.com/ckfinder/userfiles/files/tawunoxabu.pdf
    • http://leruichem.com/upload/files/65272722066.pdf
    • https://tktravelkorea.com/FileData/ckfinder/files/20210906_A7DFD1C5FCF77B81.pdf
    • https://millvalley.com/wysiwygfiles/file/67863665367.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368c2ab2cc8---volebexa.pdf
    • http://rayanchem.com/d/files/94889386796.pdf
    • http://phukhoabacninh.com/images/files/tajaser.pdf
    • https://chiataiec.com/userfiles/Proj_Name/files/vuwujawisabej.pdf
    • http://clinicaveterinariabilancino.it/userfiles/files/36360924225.pdf
    • http://tincorner.vn/uploads/files/lajokuk.pdf
    • http://topoint.net/userfiles/fckFile/20210909235114.pdf
    • http://888chji.com/userfiles/files/peludokikivuxe.pdf
    • http://nomayaku.com/userfiles/file/wotekoxe.pdf
    • https://sherwoodchamber.org/ckfinder/userfiles/files/jawegaluzazo.pdf
    • http://uitvaartverzorgingsindex.nl/images/uploads/zakezusawob.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off0000c37f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC37F 16792 bytes
font_01_sfnt_off0000db96.bin
efc531419ed08ec988518f009ac59ff6e7577775c29a9fd6cfe3f912243e2eb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB96 11028 bytes
font_02_sfnt_off0000f507.bin
c761871cd67989dde36dbf9963e45bf4a9b35eddc607fc1e25d11524046ddd6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 17668 bytes

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