Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b5673f64bca04b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 21:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c06469d3c191a67a0d83ce2ecf918a0 SHA-1: e6f09c92f0abfc5b25d78479b0f0eb4b72213a3b SHA-256: 78b5673f64bca04b68117f9bfba72c1f8e96e494b02a27bc2627c45941a21dbc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://dragonspond.com/uploads/files/13502709607.pdf In PDF document text
    • http://circuitoinsulargc.com/documentos/file/ditizujilapo.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/68015987320.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/29821072240.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/81441737525.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/9fefcf3b9db58e290ce52d6990269a29/4311545555.pdfIn PDF document text
    • https://norservis.cz/files/files/sekitu.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/22587647561.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/kabapu.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f3c35cde8---zivoxumupisewuz.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94912274084.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/vitipitewizur.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/72921159201.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/debavosawonosuzopazero.pdfIn PDF document text
    • http://millecolori.it/images/file/judopuguvi.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/77002085992.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/63004051093.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/9d71a6067e92dea112bab28f359b96f7/65571541437.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/kakukivatonoweviwepuxiw.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/raxinofirudatadifexidesi.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/37379841221.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/fujufodazozimekezix.pdfIn PDF document text
    • http://sdes.in/uploads/55586319863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=dear+ijeawele+pdf+free+downloadPDF 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_off0000d9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AE 18048 bytes
SHA-256: e76c6481dc49ceff3054bf06566f1b1dc3f7cf1bdb235bdb82c9c9c7950a4221
font_01_sfnt_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12106 10440 bytes
SHA-256: c9dcadf02ad7cd54eb9ba317591774a8f6c9413d5a72f3af865c30bbf3eedb6e

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