Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93488ea5ac4dc43…

MALICIOUS

PDF

85.5 KB Created: 2021-07-03 13:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 382daa562b97d1432bbf8ab5be1769e8 SHA-1: f8d73efe94baae9845cf37b63373c7d181eda3fd SHA-256: e93488ea5ac4dc43cf347f989c145df5d4ff2dde6a7b4829410efa8b88eb2c60
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the heuristic firings suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fw-simple.com/uploads/files/80470459861.pdf In PDF document text
    • http://envigest.cz/upload/file/nivukax.pdfIn PDF document text
    • http://meyras-tourisme.com/ressource/site-image/files/dolukomenizororutukiba.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/buladikal.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/53067422401.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/6oeqftfu4dcsm3ncukmhlui3i7/difovorogewafuduge.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/pujovuwadejilimegoveti.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/27520142741.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/urdu8lpmbii9crnce9tnkv8e43/40919901311.pdfIn PDF document text
    • http://cl-pub.com/files/files/44532052435.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/jipewexitujutiwi.pdfIn PDF document text
    • https://flyfinz.com/userfiles/files/rozutowovitijetugogire.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/75ebe3cefd98acb978336477460140ad/rajuwusuzi.pdfIn PDF document text
    • http://weddingceremoniesbybev.com/clients/72651/File/6223247014.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdd1d843aa---17011733302.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/razezo.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/c2bd47abf8b1aa992038902186292065/88079470438.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/vejakisunogigon.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/23a2df9aa2bf0aa1abfaaa154806ef0c/16429621369.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160807c94ab600---84176359586.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/24691367630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=content+and+pedagogyPDF 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_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 16784 bytes
SHA-256: cf159db9a50763d8924adb93782b46f23c4c1cb71633bd4e1f079a1b906f68c6
font_01_sfnt_off00011a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A13 10308 bytes
SHA-256: 8c92f58e20ab9ea2ede4c59ca2be54783ba671ee767d84701cf89d79f5be05e5
font_02_sfnt_off00013144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1