Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbda4e51e26b0027…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 15:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a0c6a621646d94fbe784534382c37061 SHA-1: d9cf6125536d6d0b7f133e0c4d8f0e63a391ac63 SHA-256: dbda4e51e26b00274ca448b307787ec82b8be3219dbd0df8446c63a82937c9b6
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to PDF files hosted on various websites. Heuristics indicate these are link farms, with some hosted on compromised CMS uploads. The ML classifier strongly flagged this PDF as malicious. The document body is unreadable, but the structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/8917292f89b6ffd35a16dd1ff96d059f/torunoniruv.pdf In PDF document text
    • http://skulpt.in/admin/uploads/file/fusaxabiwebiposa.pdfIn PDF document text
    • http://topp.pl/_topp/file/9115480151.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/78000349226.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/82156637682.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/geguloz.pdfIn PDF document text
    • https://festacontinua.it/public/file/46805848714.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/25077120775.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/pizimigukizisozule.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/pefabonibafubisanej.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/nesafisapiwinenodititeriz.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/21387932424.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/82508267288.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161395c6cb16cf---12869387544.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/45736691869.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/jojusidunafuteg.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345acc2a761---rifulobafixigawovisetiz.pdfIn PDF document text
    • http://identik.hu/editor_up/36811494349.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/kedavoxuzajisoniwaf.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/1538386416.pdfIn PDF document text
    • http://proxima-design.cz/files/file/fatixaxokomawigib.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/890146bc9e7bdbb9f2abb2e528f46308/lidom.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/josuwaruzupijokotudusuze.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/wepepipakixisa.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350b393caf0---70052370608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=fs+17+apk+download+for+androidPDF 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_off0000dd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 17616 bytes
SHA-256: 3bc78a9b688d9495629c161836b7d8695b89b1324cb40ca8349d3394ec860780
font_01_sfnt_off00010b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12370 10516 bytes
SHA-256: d478648f161915c3ea0c1700c53ef335f231ff21e3655144ea8a97fedda4fffe

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