Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e24ebbb1882dc10…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 03:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 08095896f4ef6e4fe0549d64aa06a38a SHA-1: 4ab7765d37b613cc11c7fa6cd4a9273c26515f6c SHA-256: 1e24ebbb1882dc1006a79b9911e263b9ad0de9605243213dc9ed36a68a2bc5e8
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baoholaodong24.com/userfiles/file/zasasinepojemivuliza.pdf In PDF document text
    • https://beauty-full.ru/uploads/files/10669756583.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/lijizadogapulomusovenamox.pdfIn PDF document text
    • http://kelvista.lt/images/files/77940883188.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/fisidavogo.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/nofanuwujusubinenedamel.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/sanibisujarezoto.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/33c9fce130d834de05124ee5fa93ca84/numadu.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/73479948613.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/boxepari.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/vonosaveb.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/bewemamufanigebived.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/94538813977.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/lizoramojemireponenebovu.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/litawuteverivilona.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/sudewunonitukob.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/44431704562.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/tewivutosaluzivaluzuzusag.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109180633173857.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/zokofaxiveno.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/sazerelitof.pdfIn PDF document text
    • http://nfc.soo.jp/file/majusaxuv.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16134872ed59f7---pobulex.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318ddf62f08---susefuv.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/59230183905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+find+duplicate+photos+on+androidPDF 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_off0000df5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5F 10892 bytes
SHA-256: 19b86e57bf9bf7a97a06bf982c57563b8e28a4e2acfaf1d01769d8c12f146286
font_01_sfnt_off0000f887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11099 19052 bytes
SHA-256: 2fc3143fc015abcb679d5f068c91a995e9446dfd87a6336a2d96fe6550ca2d67

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