Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e19c023abae20d4…

MALICIOUS

PDF

74.6 KB Created: 2021-09-08 23:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3b91d498b0d1eb9dc0ab0553e2cc7887 SHA-1: 81c68dc5980d5017a62c6bc38508d8f0b5ba6d45 SHA-256: 9e19c023abae20d40b24b91e649dec10a1c0db33b840d561c1cfad9b9413a8c3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites 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 malware delivery. The file's structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=download+software+samsung+galaxy+young+gt+s5360 PDF link annotation
    • http://muszempilla.com/files/file/sobenunu.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/wikibigufikunogugit.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/xeguvagod.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/bodubuzawivu.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/c42f69b8fe2f7fb2c9121f4979af6f66/wamijupikiwuzetepiratas.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/19462085039.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/bee2ded864eed43d998f832b63a7216e/62710117141.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/depubasataxubuxix.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/23307852482.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/45398057552.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/lebinigulo.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa010455d---bopalevusa.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/bikox.pdfIn PDF document text
    • https://loctra.net/userfiles/file/81903001439.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6b0cc732448a73a3119818eb30f8efb4/xixirabajat.pdfIn PDF document text
    • http://st03.it/userfiles/files/tukumugewej.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/kebigikikexiwu.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/54209208217.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/20773391076.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/76501113505.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/21414818511.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/jibibujivanaxo.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_off0000bdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCA 16880 bytes
SHA-256: 1cd1cdbb62d6b06236e416ee621ac12235eb566162bde14e315201c0d4d42fa4
font_01_sfnt_off0000e8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E9 11604 bytes
SHA-256: 072777eec5febb124b8e4076158d470819a749f25dac3ecd65a5b290e07b2e8f
font_02_sfnt_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1