Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9975eeb19e3ac6f…

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 13:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a2c1c42549bd93b856b9656ead0e6da SHA-1: d404feb9cc99227ef7c5e40d22f5e0ef7a1825af SHA-256: b9975eeb19e3ac6fa7af425c0ca5f673adda2781faf60d88bb58ce3e1f5cedd4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly suggests maliciousness. The presence of multiple external URIs and link farm heuristics supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://coretry.ru/uplcv?utm_term=best+photo+text+editor+app+for+android PDF link annotation
    • http://elisa5888.com/shopadmin/upload/files/95893671663.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/xivojenipetivu.pdfIn PDF document text
    • https://finliz.lt/i/File/74596031056.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee7ff9578f---14568559430.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/9617184389.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/tarozemepiwubusudagema.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/weregasudokoj.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/sebuvizavasexuvofajuf.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/fijitikuretamukitobakuje.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/61804658152.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/31726263208.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/pivetupokimaxo.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/bodovoneporamone.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/5850771140.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/wozadododatagixed.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/bofedemurevomefulasex.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/nulipafajivawotijutok.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/nuravotaliseruwitunatodul.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/lolifokidenafebim.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-4/20210904043752708653.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/10787560556.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d78e3b791---godoforupop.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/59233616383.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ecb05a5f1---63896326702.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/ravajalufutare.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/telegagetawekituj.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/gakiravaxusuj.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_off0000e1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FE 10704 bytes
SHA-256: 4469fcf100dd7bbae3a2d69f9fabe610f8c34201212159efff385266d8917534
font_02_sfnt_off00011289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11289 20044 bytes
SHA-256: 2200f77b1eb31a30e765d32690c7b71753b917fae35be90ce667e127a5507b48

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