Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf8b5d1a2b41ffe…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 00:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d171bec9fcd70b695b7f7b1f2fe8c658 SHA-1: 650bbfc1565eebebabc07ca5fecb3e1b6b3279d3 SHA-256: 2cf8b5d1a2b41ffe2e75540d08859a2c8006645d21b1fa3d9f40cdb7809e41a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=al+sudais+full+quran+offline+apk PDF link annotation
    • http://ggmtc.net/userfiles/files/93228585226.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/wuzaniworexugatoziwux.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/neforujaxufodivinezu.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/mutesifebuxuwivime.pdfIn PDF document text
    • http://unibox.lv/files/text/gijemewepezuzeduzadi.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/85858142278.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090203380273499.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/27445193550.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/tisixenisiga.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/logol.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kiverujeli.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/19995198612.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/62848804717.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e74a8766c8---nogomanisix.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133db282107d---88625974268.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/viboruxizodofiruf.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/pusujizidolag.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/wikerezudawupa.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/jefumefik.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/xutevejifefopatorusuxa.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/1636437696.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be4899d896---14702741177.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/rimupozolegas.pdfIn PDF document text
    • http://gibisch.org/files/files/57557520686.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/52724838590.pdfIn PDF document text
    • 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_off0000d792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD792 16832 bytes
SHA-256: f92e319c5c846b2530898868a86d41874795414670b794e8acd117cbbd3eed1f
font_01_sfnt_off00010327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3E 10712 bytes
SHA-256: beeabe145a61121319ae6bb092eaa7a10295048f6e5b4eeffe2035dcf4787b06

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