Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3048821d7d975f…

MALICIOUS

PDF

81.9 KB Created: 2021-07-20 13:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78d7f84680d1dddb81f602f97ed0fc8b SHA-1: b958f044e33f42cfe283c2b13898fb5b0458c8e8 SHA-256: 9f3048821d7d975f08bedad55f7541f56002a001899a97ffda20869d51081973
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and embedded URLs suggest an attempt to host or link to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/36389563008.pdf
    • https://quaint-house.com/lavimekebarili.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072db60e07c0---66642579408.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/4cf577d914b109f68f76d14f7e9430b4/80209900511.pdf
    • http://iaestedresden.de/userfiles/file/64209781813.pdf
    • http://akcjonariusz.com/UserFiles/file/kusufafobufovakupovaxer.pdf
    • https://betentour.com/sites/default/files/file/89840999214.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/d3ad3abf2c6d8d0c8f68e51725dfbc01/36079145965.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4759265dc7---69598093304.pdf
    • http://fatamorgana.fr/uploads/assets/file/pilojori.pdf
    • http://benetalent.com/upload/files/21524601802.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/c9c14146c504e370e415fbdf649655b9/jowutepifavo.pdf
    • http://fly.no1-yes.com/userfiles/file/kamerevolugufumetoke.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c13aa75187d---4539644400.pdf
    • https://topjobsnepal.com/ckfinder/userfiles/files/27760122253.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607db00ced25f---71270633045.pdf
    • http://crmloccitanecr.com/campannas/file/bezul.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dda0505a570---95637058311.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/aa11ad8fbb8ceac87c3b5ddde7a278a4/61609272811.pdf
    • http://jplus-ag.com/upload/files/BodyFile__60D9F3B56AB42.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607828b56e7cb---patunilaxawajef.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=company+law+scanner+for+cs+executive+pdf
    • 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://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_off0000db49.bin
24a8e7198ca2e8c07f6178ab5b10530c3deaf16c4e7c6b8d3e788a4f0b0edaca
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB49 17056 bytes
font_01_sfnt_off000107c9.bin
07e6832cf3b7b1383c19853282da169aafc427d0b7136744459f6cdac19a3f35
pdf-font-stream PDF embedded font (sfnt) at offset 0x107C9 11280 bytes
font_02_sfnt_off00012261.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12261 16792 bytes