Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedf9f5b3f2c0862…

MALICIOUS

PDF

83.2 KB Created: 2021-08-16 00:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5c1686f0c4117c87e852c8885ac58266 SHA-1: 15a209f20d0bda333f913e6b29ae86d49bcf842e SHA-256: cedf9f5b3f2c0862d5e81454944d91d0ac5287104ffca0c284d884d75cf3dcde
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or to distribute further malware. The presence of external URIs and link farm heuristics suggests this document is part of a larger campaign, possibly initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.de.ruben.pl/ckfinder/userfiles/files/53229037044.pdf In PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/6392566478.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b36227a1c---55102583102.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/f7d0456a4294b6c1e8260e1f3d01f283/gitalujofukabono.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16092692f15710---11926703768.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/moguvemuxosunaxikolokukox.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02c49ae416---dosamarosegazeburemavesul.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/39795332152.pdfIn PDF document text
    • http://nwmanagement.ru/generic/uploaded/file/pafinumavulufuxigisolu.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/48315928540.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca6a2403ce---somukepuduseduru.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/nutivefizirip.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/xebusezurexofebuse.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/b01ddf4ff1d706d71cb9ba1175fb2926/ruxelowunalometugutaxabo.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923868780aa---zogituruzalejabanik.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/75706105085.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/8022448841.pdfIn PDF document text
    • http://erdbau-rauch.at/dedejebaviwa.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/34758537573.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/720c06c6cdd294c36fd2b94f331d5e1b/67501577398.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/31ec4accedb0ecac0cb7364ae10bd4cc/burakezazoxa.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43713032617.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/tegaji.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/30031737810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+fix+not+registered+on+network+airtelPDF 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_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 16780 bytes
SHA-256: b0d8e520cac302d9d5613fc507dbaf0c48a9e6e88acf48f1056d0501db9baccd
font_02_sfnt_off0001248b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248B 10800 bytes
SHA-256: 4369b2b1c4ee0ed00108eb7df130f0232f4659dfb8cee3145a04f4cfd6ec8b3d

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