Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab99173e29d1987…

MALICIOUS

PDF

84.0 KB Created: 2021-09-22 19:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e7d2dcad33e3f53dd74879de4fd502b SHA-1: 80d6f29290d4f31500e4e65eb41439fb82e5c7cd SHA-256: fab99173e29d198744ea9b3d317b30276b490dac2ceb4f32796b6e38ccd61ca6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads and disposable domains. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://privateeducation.sg/verzsape/demo/upload/admin/files/nipenivejusa.pdf In PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/1465275883.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab1d55bca8---97356346124.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/30369508434.pdfIn PDF document text
    • https://airbays.com/userfiles/file/valesejome.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/78523599686.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/jokawasigipijisejojubiwib.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/b96ff36cbc0815646fac4e321f173370/vaxuvupir.pdfIn PDF document text
    • http://medica-brno.com/files/jamavapakal.pdfIn PDF document text
    • https://theurbanthinktank.com/files/29757735071.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/vesugifev.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/57810855341.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147cfdb14eec---26437074003.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/18746753136.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/jojagujidurutevokorafuxut.pdfIn PDF document text
    • http://potlista.com/file/files/21178207403.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/5d1e71764812a4b83aca76c052591191/pogata.pdfIn PDF document text
    • http://metallpress.info/files/depifazirux.pdfIn PDF document text
    • http://techbis.pl/files/file/rojar.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/tokiteremewupavajuragiz.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/36358121268.pdfIn PDF document text
    • https://ocloud.millionserenity.com/images/upload/files/46835264681.pdfIn PDF document text
    • https://estoniapools.com/contents/files/dawen.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/fodujavolefegowabureb.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/jowetidunarewinu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16142d86b1e96f---65565403586.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109152008295708.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/zilixatikivimutog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=s10+launcher+proPDF 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_off0000e2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 10460 bytes
SHA-256: 6e52ac6cb86af256e2b0d769b78ba4c52c0207a78d5ab2c8410ac677e0323d80
font_01_sfnt_off0000fa83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 18436 bytes
SHA-256: 985513e891bff3613de725a5f13928e2f9c2fa9975bf7dd44bd9bd296e65f4ac
font_02_sfnt_off00012a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1