Malicious PDF — malware analysis report

Static analysis result for SHA-256 9062344f7c70b4dc…

MALICIOUS

PDF

87.0 KB Created: 2021-09-04 04:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e9d3733546efb71e7d8bf9ce069fe5e7 SHA-1: 4a3c9425c297a2c70c0815d4810d6d9e30f96930 SHA-256: 9062344f7c70b4dc9c7032750f357f42d4bd9dde7ea3d277229bba4c1919544f
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting. The presence of these links suggests an attempt to lure users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://bassbasement.org/userfiles/file/38416218735.pdf In PDF document text
    • https://elitstroycraft.ru/source/file/farufibefuvudem.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/99871664040.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/1e7o8qmaoko5a2pot2hg7o1nt0/1461022175.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9b5bd1e5b---nifosowelamodibefo.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/522613889.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/68853695091.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/qe8fck5uj3g5bk9gh2ptasis71/64352884625.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/23391195834.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/fuxufekadan.pdfIn PDF document text
    • http://aweibel.com/Photo/file/fatabax.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad7c1755e---92115785063.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/gejufanoxebumadetuwodusa.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/forosovojutekofude.pdfIn PDF document text
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/58546610459.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210822_6092742EA68F73E7.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c752f01aaa9---tipikipekixiw.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132480c1a7a0---tozegewazadopefu.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/dawizasariv.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/46952971764.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/didun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=improve+interpersonal+communication+skills+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_off0000ed9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 18132 bytes
SHA-256: ea7a633e25bc5a161d8ed04f99e7cd81b67b294415634172769c0218cc11d6de
font_01_sfnt_off00011c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001346b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346B 10992 bytes
SHA-256: 51e7012a3bef9f5d79bd52b8fb5cffddeb701bb6181c1e1363e713a097f3bc2e

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