Malicious PDF — malware analysis report

Static analysis result for SHA-256 d604f2c17085bd79…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 02:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f71ae8ef296f4dd5234c18550567007e SHA-1: 9a6a07e6ec8d38d53d26634889fb691295f387f6 SHA-256: d604f2c17085bd79290fb21d7287455e96a8fe6cc8c9747f0d9ede5660487ed3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous external URIs and link farms, many hosted on compromised WordPress sites or disposable domains, strongly suggests a phishing or malware distribution attempt. The ML classifier also returned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=my+onlyfans+account+was+hacked PDF link annotation
    • http://hatdesechia.com/storage/ckfinder/files/11836117194.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4fc7480d2.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/nilofirujajerig.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/mesenerino.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/52431574483.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/6184686438.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/47586001975.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/70594139069.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/3261361654.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/dujomudezuzokujuradogo.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/93664526890.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/84c65eb981f5e71beeafc00389522864/rugarofifedax.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/75598897453.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/33793250805.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/34454153263.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/rogazawazipe.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/gevodegibuzitixokim.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/99915207729.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/zipotuxepog.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/kiburovisigazunetumene.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/wawedutefejazaridebapulik.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/26047203133.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450fa1835bc---jikupunexowaxixewigos.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_off0000e76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76E 10768 bytes
SHA-256: 0c857fc2bf56ad5f2d7c8d2d2236505807cd939a1a76035754c1dc5507ff02bf
font_01_sfnt_off00010051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11863 18272 bytes
SHA-256: 3f81c5c165b94aa76c20c8f680cc9552d7d4c9a6d6681f6e99931663bb910901