Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9230a4c2b8b0130…

MALICIOUS

PDF

89.6 KB Created: 2021-09-07 10:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a1439519a2f56786a0535de514e9383a SHA-1: 875c07211bcc296bfa884a79ddafd63d01c0e404 SHA-256: f9230a4c2b8b013042344528749bda978628f4e71c10b8488f0770800b2e9cb7
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to other PDF files hosted on various websites, many of which appear to be compromised. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/jemeniwizadedi.pdf In PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c3c674e28---80758113418.pdfIn PDF document text
    • https://bgmediation-flm.com/userfiles/file/lutek.pdfIn PDF document text
    • https://norservis.info/files/files/popuzofufevotinitug.pdfIn PDF document text
    • https://proxus.nl/file/nasexenewozodevobexasogin.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/04bcbab5fb0c65feac8f8d4da5b22716/47665638826.pdfIn PDF document text
    • https://scriptdd.com/_file/file/vesitot.pdfIn PDF document text
    • https://italvaping.com/file/gugubolepakeruxuri.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/vobumimevigav.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/11133633569.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607228b6610c4---30865142159.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/wanokuz.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/mulepudetikod.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc429ee513d---40179273486.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/pufavelolekasebefeg.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/97394007809.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986a4dc60ee---vibisofapamomukedube.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/rejexilobeletiworum.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/46697023276.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160eca7b168e8f---tamexokam.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/tududamutibolus.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/63161b46acf9ea56797fb39e0490d3e7/zotiduk.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bae3d5438---73675173034.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086b8f7897bf---fakarikewetozex.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/38oflef5cvqjaupflc9aogivm3/28172260850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=davis+vantage+vue+manual+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_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D11 18992 bytes
SHA-256: 9dee3fb48e2b0397fbeccda6a8967130a81a5e1af5ca5a1b81f0a48b29ea4383
font_02_sfnt_off00013e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E56 10788 bytes
SHA-256: 89350e933f29166861bf7c077536323aecec208bc9fc04eec23ea56f241da3ec

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