Malicious PDF — malware analysis report

Static analysis result for SHA-256 9581d93a9985ec90…

MALICIOUS

PDF

99.7 KB Created: 2021-09-07 16:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 56fc0532212c0ad978354991e3c33a76 SHA-1: 5aec8028b815c3aeec7961fb736b5458a8383e58 SHA-256: 9581d93a9985ec90d6df66bec8abfb8b13f242062334967ea3022ed90330d0ad
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is unreadable, but the presence of compromised CMS upload links and disposable hosting points to a coordinated effort to distribute harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://activepymes.com/pub/file/51358299199.pdf In PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/f3c56f24c8044872c237cf28f6c33619/15771282160.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/db9b3afe3110f920af9923775753e36b/gososa.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/79541496069.pdfIn PDF document text
    • http://gysanya.com/upload/file/210818230959080921wxj2b8hlmzg9.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/rititosifeja.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/77751fb4d1fae31ed308265a32e13e46/sixibuganivum.pdfIn PDF document text
    • http://rent-1.es/ckfinder/userfiles/files/sinikunoliwigolita.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/mukeleribavufedodimezo.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/48667399464.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/40e9ed3b1b753c66918dfee7a6c66900/97681572636.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/274aaf03ce7300b0ca9dfa4c12342153/notetudeberasejisoxige.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/tesizawajek.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1eb43818e2---86163616549.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/1113129537.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f663c1850---25264617994.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/et2qosointtuonr1plfmhb3v54/78209487577.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/3186449739.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da303c31913---70569841938.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a445a36c7f2---2969499479.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/nuxorik.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/wesijalilolabunolanuweji.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/46253716757.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/wedezolenufepipubejex.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/84656504040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=productividad+primaria+y+secundaria+pdfPDF 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_off00011bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCF 20144 bytes
SHA-256: aa65f96748eeb2bbc3ba9b6bf7e4274c2d5394dcd6e97a6bc86734a63e2f76db
font_01_sfnt_off00014f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F81 11016 bytes
SHA-256: 6c60bff565e4f34721c5ee4229ce3644fe00357d6baeea9e0f71e29d3d585e9d
font_02_sfnt_off00016933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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