Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57160ac1a1b1103…

MALICIOUS

PDF

84.0 KB Created: 2021-06-14 12:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76b4314c0123481ec8658da52d8c512a SHA-1: d67e6929894703d45573c33d4615fc8042c5bafb SHA-256: c57160ac1a1b11035c62f0650e5c548794244c250dcd7202d058c1e13f41218a
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains an exploit. The file functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://archism.ru/uplcv?utm_term=cbse+10th+tamil+book+pdf
    • http://pokorny-podlahy.cz/UserFiles/File/40817393851.pdf
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xenexagizaru.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f97b219155---21067788876.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6192e7d020---46332167958.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/9b253a1dbfac7a119d053ceaee8037a3/lofetemapenil.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16082fafb38bc4---12178286759.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/b4bfb86a868c83293180656486f2f98a/90850115464.pdf
    • http://aire-limpio.com/img/editor/file/95559818741.pdf
    • http://antae.be/app/webroot/uploads/file/20795697887.pdf
    • http://teplolux72.ru/upload/file/28426287786.pdf
    • http://stlnsk.ru/uploads/file/bogabomaxaza.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16078017e680dc---4305723395.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae50567e2d---besedopetozemunofafamo.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ab9399e59---putagokirasizovuvotuno.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/60a30ec1b470399fd17ec79f3aa8df32/48872100612.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/c7a10383ecb4320b290f72d0a4effb7e/raweg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • 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_off0000f13c.bin
db04cebab710047f72cc6afd26c98b49613d74659a185a7cac3bfbf2e05c70ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 5488 bytes
font_01_sfnt_off000103be.bin
a2bd540b5733a84c4ea5ad07d69bda35c385614a30f0948f7416260227bd1591		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 12036 bytes
font_02_sfnt_off00012bc5.bin
31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC5 16204 bytes

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