Malicious PDF — malware analysis report

Static analysis result for SHA-256 623a6bafe36a534a…

MALICIOUS

PDF

86.6 KB Created: 2021-06-30 15:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 115c049a0c765be75938d31a0a168b4a SHA-1: 168e709ad706dc30108a60fac7e2fa213959207a SHA-256: 623a6bafe36a534a82bef0229ff44d3f95605df3ab0723dd7697cc55dbe64e2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to lure users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://garglob.ru/uplcv?utm_term=then+comma+after
    • http://alltechsro.cz/files/11188641560.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/07f33d6cf1a9e24f7d8b73c34fc434a5/75973129212.pdf
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/fomipemelesajejaguwipux.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607252383c9f4---denawotivas.pdf
    • http://waelfawzy.com/userfiles/file/73422824228.pdf
    • http://ac-kenigsberg.ru/files/file/zabuguzer.pdf
    • https://ludifrance.fr/userfiles/file/zatukima.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b96013483---40879097317.pdf
    • https://marmarases.com/upload/ckfinder/files/rexajipozokisupunoputig.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/80080239425.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/23db35c56010ca1ec3c98da68a7d6459/zumufa.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084ec4c22e5d---67959924002.pdf
    • http://paradisoseminatrici.it/userfiles/files/vovarenazisax.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/b4a66488c8a10eed835ba40aa0781c3e/legukinolejidevivibufaser.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/ctlqpejgkig922p2bab9uv3e8k/45093686217.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd28548168---93832715405.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609091563491a---63099328727.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/6ec0a87d8963b78ed965ff2f57e7f0c0/80876765730.pdf
    • http://519pf.com/userfiles/files/34505503330.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd4af4c833---gakefanebupinib.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cb53cde11d1---16102516202.pdf
    • http://ahxxzx.com/userfiles/202104/file/57244924683.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_off0000f17c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 16792 bytes
font_01_sfnt_off00010993.bin
ff371cc82c1b3f9c02160f6ccf5221d5dbc1f056f9e7b45b7214c701f0c7a58b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10993 10256 bytes
font_02_sfnt_off00012067.bin
1467b31e9642d2e59865dfed186cb26afab46268d14641b7bf842071025b3dae
pdf-font-stream PDF embedded font (sfnt) at offset 0x12067 17260 bytes