Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce6a2aa837f1228…

MALICIOUS

PDF

84.6 KB Created: 2021-09-16 07:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8e7202faff9ec03853c4a3075febcb0 SHA-1: ad849766e0e9cfc2e7b6609f97e1bf40b20e512f SHA-256: 2ce6a2aa837f122812cd4d3339a3f1ba7b991e0df927c25dd7e62dac9a3d4320
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs supports the conclusion that the document is designed to lead users to potentially harmful websites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pixomot.ru/uplcv?utm_term=app+for+android+to+android+transfer PDF link annotation
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ighkfp7f2pjr9p0odp65dkt110/53987566363.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/xabaluvelawodudowomok.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/xezuboxavugoxifeba.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/88087049827.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/zositudebidizefasenagudo.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/magugajapoj.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/sunefajiserijuvi.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef0d1bf6de---bomavodiranabenig.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/gatiterifad.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/7945078231.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/mufojatof.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210911_E22AAC9A592E244D.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161371665a0056---17638988243.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210911164745.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325ff25089c---munimexesamaxuxizizamuguw.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161407ed13ed96---75103687220.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/483101928961631712135.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_off0000e82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 17620 bytes
SHA-256: 4ed0f388bbd5af69c3d2205a166b83aa19210c5fc6739b50ca3a3ba40ff28f21
font_01_sfnt_off00011547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11547 10428 bytes
SHA-256: 75ab921f74ecd7d21a70d7a797766d14f174e16c841770a4d3f69ba9a69c48d6
font_02_sfnt_off00012d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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