Malicious PDF — malware analysis report

Static analysis result for SHA-256 2649835ff92055cf…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 06:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 79b952cb02d836300f7b35d197b71efe SHA-1: 2c8b9b59efbf23aa584fc58a8bbd3b1706047ffa SHA-256: 2649835ff92055cf44c072e6429e6d443251b84e158972e5cf6dc8b55503e55d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites, many of which are hosted on WordPress installations and utilize form upload plugins, suggesting a coordinated effort to distribute malicious files. The presence of these links indicates an attempt to lure users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/483f269158c46a1051ee375b3143f2d6/zosulemafen.pdf In PDF document text
    • http://bangdientunhk.com/upload/files/32537566228.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607428e2a5df6---revukuzojinebut.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df26de490e---71518404602.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc51c80729---42183202687.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/47446164948.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607837d45c207---jabosawamifovozegi.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/31912546601.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/viladigo.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/nn9ngia5721eos6e67ft0ksgth/jozibezixejoperowu.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/ajg3qn2vpt4obtks2335an4gbl/biwiw.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/wijine.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/muvosokoxunilovubufenor.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/62960961080.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/81144879851.pdfIn PDF document text
    • https://tigapilar.com/upload/files/nenoxugiwuwujipununul.pdfIn PDF document text
    • http://caramelitos.sk/files/48363825338.pdfIn PDF document text
    • http://vititanon.com/user_img/files/51565663954.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/60644675110.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/uoo06735e0k5ho6d47q60mm0jo/kagatumobefufunetejozal.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/4932534324ca91e4fb2697d6267473b9/13876529443.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/vedefikuluzaragafowena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hope+all+goes+well+todayPDF 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_off0000d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 18872 bytes
SHA-256: 3266971b5a4d1b78788784f0371a78276ebd02d3f4390331ef1773391ffa6604
font_01_sfnt_off00010a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0D 10464 bytes
SHA-256: 04bd53d2980c8c8facd34b04e163031efd6b62684b0b4139247f4512a4ed9bc4
font_02_sfnt_off000121d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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