Malicious PDF — malware analysis report

Static analysis result for SHA-256 addc05091225f892…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 23:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d100ec79059d4d1e76cca3a03cbec8a1 SHA-1: 3e22349316e5838f151e15a8c5201b32898b106b SHA-256: addc05091225f8928e6a4cd92466ba73929c680827458887fc837c25a16cef02
96 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to numerous URLs, several of which are hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially malicious or SEO-manipulated content supports this assessment. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://marine-inox.com/i/File/wikonalozamufadebeko.pdf In PDF document text
    • http://shanghaiqingchen.com/upload/files/76723002598.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71344171687.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/89739308399.pdfIn PDF document text
    • http://ustunongel.com/image/files/baromokerewebavoruze.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/seregotezabivelivek.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613882ef8dcee---45556307982.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/nekazizezexotuzovap.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/2916370470.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xopasevirosofuwase.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/51946101277.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/lorikerilinizisuwuxip.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/66835072403.pdfIn PDF document text
    • http://ipceurope.com/assets/file/fapag.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/xasororafogutujepo.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/77299513702.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/jokarebobusadebimuk.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443b6cb2a9f---34502249617.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373503c97f9---xegozon.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/95481011463.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210910/files/20210910221720.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133163a5c4e7---xezuxi.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/15782849692.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d57501dce---gafuxinalaxerif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=shortcut+key+for+duplicate+tab+in+chromePDF 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_off0000d175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD175 21104 bytes
SHA-256: cf5b73b3fac384ead63b16562f1798e40d6a32875d2afd7ac1996433be5fae49
font_01_sfnt_off000108c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D8 11236 bytes
SHA-256: 9c10e9410470a3b080bbe2e0fb9135c7751a8ea6c4dbe510ee64499ea2006fb2