Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d5f6f3bdb54dec…

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 15:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 35f2b509abb25613b7bf600fb2ce6566 SHA-1: 610ecd4c59e9eef96510c36478f6c2cef1a80b2f SHA-256: 08d5f6f3bdb54dec256c0701ed3b53469ecec4a80d3df4c9cf1095cc4202e8af
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised CMS uploads and disposable hosting. While no scripts were extracted, the document's structure and numerous embedded URLs suggest an attempt to redirect users to potentially malicious sites, possibly for SEO spam or to serve further payloads.

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://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fdeae30d6---ziloratejip.pdf In PDF document text
    • http://theclubburger.com/uploads/files/465483470.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160adb7c87d2ab---wejeniguti.pdfIn PDF document text
    • https://strechybenesov.cz/content/17709370006.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/wamobi.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/38031466735.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/q09v7mn37s6960qrtr2ucs08f6/mowozadapoxo.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dd2d8739d---49257901852.pdfIn PDF document text
    • http://taxfreepoint.com/file/wematadujorumavef.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/dozudivixo.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/92f7919e8a729db307240439e2b07c53/jevijibafuwet.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///93320708630.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/58640601625.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/ae8829e5bd2c0a3cc20f0b65c2a69c63/40258130650.pdfIn PDF document text
    • https://edgecs.com/documents/teneruxibofuvaboxesimipes.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/690322caa05a9adc5f980a324cb684f3/benapadafixenofivomodi.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608301fc22018---42242570336.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ed10c294a---96347186309.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/70278843918.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/aeb9c1575c42c7daba83ac1b831b421d/jexisipuzes.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c4fdd2cee---zujaba.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99070fed7---venezosesakadaxogeku.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/9alb63rkpj0535ofvh1k8dg1j8/borumaresufev.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/zozepasegeves.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=gl+accounting+process+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_off0000e428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 10936 bytes
SHA-256: 495db8fd5954f4d01c710be6bdca3b1c18963013737bc4d5002dd6cd0f3e6e7d
font_01_sfnt_off0000fd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD76 18040 bytes
SHA-256: 2e8a5cdd278430c69a28c8c2f911cb9b3d2383fa455afe6696a9d102c6810f8d
font_02_sfnt_off00012c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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