Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f3f94b0cbd6dc9…

MALICIOUS

PDF

77.3 KB Created: 2021-06-27 11:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f1eefd496e275caa69109e1cfc3f2cc SHA-1: a9057ece36dca59beebe3b196a3b1e55a5dd16c2 SHA-256: d4f3f94b0cbd6dc9bb677e1d90c7f91d38c0f287f3a948f8b0e7a12325eeb4ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites. The presence of these links suggests an attempt to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/04359f93a67873c7149e15f757b2d1c6/rasamuja.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/c426d5106ba249f0ad0f73d572e7251b/gapakexu.pdf
    • http://www.pranabkumar.com/fckimages/file/48641960472.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083382c0b8b5---fuvasimiza.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb7d838481---94542391495.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/3210bfdc0eafbce9c512f0a36eee2fba/dezesivajomufaxurusujaju.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/7282809879.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/16b1c1d6a0add36c7b952a25d6af69b8/35667238919.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1775b83c6---63177694421.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/3569e485d405258d882f8890e4e53e62/pajalukasevili.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/nhj26sbd6qu71f24vac4qqr2o0/38509669370.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a34e7500347---dumonojezijuporekeladaz.pdf
    • http://montazerangroup.com/uploader/file/85502412256.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c4a4e6b7e---sojalubizetero.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607462b5adde1---80596588103.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3186590cb---47915374225.pdf
    • https://aterhesseg.com/up_image/file/3793220518.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085972421854---26725723200.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728cf41a777---20236215444.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d7096a5e062---16005076533.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/17525f6f43c6a929b46bb092e7cb056e/92563347234.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e800d13013---xopetelesuruwob.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be242212fd0---dexaduwejuvu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=proveit+excel+2007+test+answers
    • 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_off0000cc28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC28 16792 bytes
font_01_sfnt_off0000e43a.bin
ddd624f2eede2fb15fe567a5dfc6dda5b41f7bea9dff163cdd107fa635ad3325
pdf-font-stream PDF embedded font (sfnt) at offset 0xE43A 16564 bytes
font_02_sfnt_off00010ef1.bin
aaff6e2a8ff059a746b095b48f16399b3fe49072bc888b0c4a41c2fdd2b482dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 10768 bytes