Malicious PDF — malware analysis report

Static analysis result for SHA-256 8307186251e58fb1…

MALICIOUS

PDF

73.9 KB Created: 2021-09-01 05:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: faca5f6a1a3bc907ab5f3db7109bb904 SHA-1: 947e39780dccea612806692203898f55d030b6a3 SHA-256: 8307186251e58fb1267ea72918d8af2125472550e26d30fcbbcb2482bca07a73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal a link farm structure pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution campaign. The embedded URLs are designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://drafthe.ru/uplcv?utm_term=post+op+check+up PDF link annotation
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074cf9bb659c---lomojobifirerefudamatid.pdfIn PDF document text
    • http://hebertfamilyreunion.com/clients/3/32/3272330ca4c68e8b1120eb7f178c7a05/File/99156786725.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/20dcc6cb12828797f72806f2208db49d/zebufubobedowinanetisi.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/51731328045.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/pabonokebuzibuzazo.pdfIn PDF document text
    • http://liily.jp/upload/file/20210818223201.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a697f6e9a82---24197564401.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061206090452.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/9092837522.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/4564441185.pdfIn PDF document text
    • http://crm333.com/documentos/file/19011887171.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607557dca2e94---mevogodinoniniwexasijufe.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/36763109838.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091d95c69912---70476330264.pdfIn PDF document text
    • http://richfieldhighschool1969.com/clients/868116/File/tajimapixobanubepeni.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/jaxawatebikulujedok.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/vipuzufawil.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/26843702254.pdfIn PDF document text
    • https://afayl.com/userfiles/file/21160744104.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/surorekelasuj.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dfbfdfad0---zatanus.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/lomamujodat.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_off0000c076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC076 10160 bytes
SHA-256: 66b719d31d2640be834a133fa60c5a0522b1aacbafb4fb76496e66842a197738
font_01_sfnt_off0000d770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD770 16452 bytes
SHA-256: 3f57aea6e9b0b2824f71173c522c4df085e58f2892df3a10ab4a3fc7879a255e
font_02_sfnt_off000101b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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