Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ba29460f4f04a1…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 18:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 383688b0dc76d4cbdae0649b13541449 SHA-1: 52c34ee1f2e72a8d149ea121f32fb4af91d48d08 SHA-256: c3ba29460f4f04a18833e865c7bf1df49bde52927fd5fa359430120540127417
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, and the structure points towards hosting or distributing further malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

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://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc1351018b---lasexajijemikavotelaf.pdf In PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c092a15344---nuwirezaririzulirariz.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/woxubatiw.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/gexokuxalem.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/lonavewubizanula.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/parejod.pdfIn PDF document text
    • http://clubchic.lv/c/i/files/zipexuje.pdfIn PDF document text
    • https://protrialse.eu/files/files/wisokesevajuwomozabo.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/nanamu.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/joledotijoluwovuzex.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/38415302776.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0c2742a9---xejukewokolitisoxolema.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/7053339450.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/74455004777.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/vadokikepilez.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f3dd5d12c---bodujolevipiwu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/43657b07d8663fdee8646a2e6a925994/reguzemagat.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/72245253640.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/71912767341.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a887579deb4---fexuzitonejexikaw.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609480406ae9e---6271424433.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcb7b82f317---878267310.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/55735208642.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/2fadaddec4c441d7b62cbaf3b6a4d0be/3088088400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=aircraft+design+pdf+downloadPDF 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_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 18400 bytes
SHA-256: 40791028a1385fd267a74ed3f6372ca6e8e3ea005eced3b6300406a30d4389a2
font_01_sfnt_off00011189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11189 10864 bytes
SHA-256: 323c3b511ff3dbf79fbfa0b9f2c8d69a48ac1de8aee69be560820e99fe3da0ee
font_02_sfnt_off00012aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1