Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f6e5e8a0a1c8e3…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 16:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ab4e83ba99362adf6174b0fb0f314c29 SHA-1: f5a2eacc915ecbb0ba4745560854ea9384744282 SHA-256: 98f6e5e8a0a1c8e340a03093a748a8b4a2f820fcefc08a4bbe5de9ddbc7efaa8
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, 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, supporting the assessment of a malicious link farm.

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://chcial.ru/uplcv?utm_term=2017+mustang+gt+automatic+vs+manual PDF link annotation
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/3ed38fae941b2e0dccf8370e75caa3be/30723380310.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/wibupoxase.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d38cca6183---folipegapu.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/35157cd2ec0bab0781595d1c54578d87/fitosokomuvawagasex.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/veeduf2rtc6sverquc68jbh234/fitikowulogugizodofubesor.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/zilirosimegixumima.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/pilibo.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/db1f399ec8b420472286ab0617e4263d/badowikiboponoravoxele.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/c63137a246764fc12adb98f9daee7480/vufovifogig.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/vr178sb14eu09bkhc3du06bic5/508183222.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea05e4fae6---mokebililowevamum.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/u7getk5lgpkl4gosigdas2f8h4/98542215714.pdfIn PDF document text
    • http://yuha.be/_files/file/rijatozuraki.pdfIn PDF document text
    • http://getvisa.ru/images/File/gipevefivuzanono.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be2110d33b4---80422520811.pdfIn PDF document text
    • http://broeinest.org/ckfinder/userfiles/files/pobowugebi.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764dd4c794e---64631961259.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/09f0c1b423ec3610cd2f41a21a20f697/tumimalid.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/83845847172.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2bc1eaebfe2a2ba3257a64c528800eea/33955727589.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/38744723864.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/74077528027.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607696580639f---delokakerabezimelikojaze.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609938b3d3e4d---75808830610.pdfIn PDF document text
    • 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_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 10756 bytes
SHA-256: ad815e6d9412ba58bf9bcc0d4a36f3cff004388bb4895ef5f32cfd368f3134d6
font_01_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B6 17492 bytes
SHA-256: 12c2714ad9b842ec8c19feb3650fdd21db281b306f221966fc6cc0f6a9f40b20

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