Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea673f9e6c16c9a4…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 22:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f81dfb59ee19f9225a40a5454cda7be4 SHA-1: dc29b14984a35ab0f3e23d7dfea312b5391b930a SHA-256: ea673f9e6c16c9a471a2a5913c8c0042ee2d1d3ca484ccb57730e9b7258215cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/650327cda1cb270adaf9214c62f4d8b7/noxerof.pdf In PDF document text
    • http://yachtandgulet.com/userfiles/file/bumasuzugetitelegebi.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160919eef79f8f---6535219493.pdfIn PDF document text
    • https://htchninc.com/d/files/zogulapisegufiroz.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99586309014.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/tozekofojefo.pdfIn PDF document text
    • http://princeverma.in/uploads/files/60034033926.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/59716043254.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/24542438134.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/nulijapogupim.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/ccb4089010d3cc36f78735f7160df5ed/43027753629.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/08r5tba92fjr7osknvl1t6fbqh/ronomewik.pdfIn PDF document text
    • http://premium-h.info/files/files/jegonorepugagixotemadefe.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/61257877078.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/2613cb079357af2bda075ff77a8e02fa/wotisogunutukiberenaneri.pdfIn PDF document text
    • http://www.emailposte.com/pictures/rarifufufeketewisixoxu.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/96813845037.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/12159941530.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dfa2738fa---25652530863.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/0d7a114dba3b28b85aba3b819b3cf0cd/87362220724.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/14569955920.pdfIn PDF document text
    • http://bienbao.org/uploads/files/xumad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=descargar+manual+de+nissan+sentra+b13+gratisPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD434 19024 bytes
SHA-256: dcfce17bb432461ef7be6d34467e756fbe8dadbcb2b93d15e60535f302739d4e
font_01_sfnt_off0001060f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060F 11056 bytes
SHA-256: ecb2342ee531c1d531e205c04efbe61de1acf4c4e2f482feec555a702e9ef4a4
font_02_sfnt_off00011faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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