Malicious PDF — malware analysis report

Static analysis result for SHA-256 99579fa760d04554…

MALICIOUS

PDF

83.5 KB Created: 2021-09-11 02:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9dcec77a8812ba564d5517658af9f320 SHA-1: 708161efdbe33b93daa72a179ba9b7194b625f39 SHA-256: 99579fa760d04554a6fcc25ad3b25af1e5f8c6db98b1d2571421e60ce62d2e9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cructi.ru/uplcv?utm_term=how+to+set+up+video+call PDF link annotation
    • https://myphi.biz/nbloom/fckuploads/file/fajetapolujojasuweb.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/tilexuzatoxejasazulux.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/18485225046.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/53687435687.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/wufeperarakijuwak.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/sepapisoxavulovozulosumot.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b50efaec857b52bf984aec24b20b9a5/luramofevadupoko.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/larenatinedute.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/38295348494.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/77223936393.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bd689f92c---xururizoresivebifexobuzok.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/ladofira.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135e38f422a0---2453367118.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613406201ee9c---29836119686.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/nitenupe.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16133e9641615c---50516701586.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/sevesezufigefomujutine.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/66875977178.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613805ba6e538---mitujog.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/25234378089.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/vumulagibi.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/vuzuzixorelasal.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_off0000e1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 17900 bytes
SHA-256: 77d6ce9b2d321f50589ab02befc2ec9f7193ee4d0e57fbae4375a72fa7ea0370
font_01_sfnt_off00010fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FED 10548 bytes
SHA-256: 719882099bd4009b51d20e82d550cd8d855a47799d92906f7113c83470c24fd3
font_02_sfnt_off00012827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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