Malicious PDF — malware analysis report

Static analysis result for SHA-256 c636a41c21ab4bac…

MALICIOUS

PDF

76.5 KB Created: 2021-09-27 01:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e2c5e25bbc8562d83c76a8f378bce654 SHA-1: 3d1c4b846d576d45d08aca007dcf3512db7a5b0b SHA-256: c636a41c21ab4bac3d52f962cca2d51701db4004f3c781ae3bfa2d9abc522742
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to distribute malicious content or phish for credentials. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://studiolegalebisantis.it/userfiles/files/75551573017.pdf In PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161324ea681a28---pomukezonimaripawid.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/83978960208.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/85180262454.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/fadululesug.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/xebedifad.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/90512437913.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134787100b43---zivusi.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_24_01_25_35_7673.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/kuxusovelon.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc89fcbcd2---japepodu.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/vokugereduzirekoxiguvasa.pdfIn PDF document text
    • http://uteambio.com/upload/files/xonitononazaxulo.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/43712040973.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/zoroserizezupizeraw.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/42975355467.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/wamemunekero.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132e267b82b4---68343278380.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/punavegogoxikenemozupo.pdfIn PDF document text
    • http://ombs.ru/uploads/files/59112045598.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/81386558884.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/melete.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/vuvitejafasiwebogibuxawam.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/xilusozojoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=d%23+scale+guitarPDF 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_off0000bdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC8 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_01_sfnt_off0000d069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD069 23376 bytes
SHA-256: 1ec11a4d5ee16c665871edd31187ef2988e3ffbe03f4d78452546209e91679c4
font_02_sfnt_off00010b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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