Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff80fe20f9703373…

MALICIOUS

PDF

76.2 KB Created: 2021-06-29 09:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 240b8303ad01f36e94ff0c4bf0580797 SHA-1: 4615d49224a3431a80c771411d3595904908ae7b SHA-256: ff80fe20f9703373959e2ec2b1d21b90908d781953ce626d10239d71d3d42efa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is intended to facilitate the download or redirection to a secondary malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=investigation+discovery+spored PDF link annotation
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2110427c9---96023324484.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/65513011417.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc55b96c6f---23757296117.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210530_3AAA3BC34249BBC1.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6fc3ae01e---retuwekewog.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/visexegusuxaweterufidu.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098abe25c431---refokax.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c48249e7211---24908828055.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ce4b0c81e---68460266577.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/as3j5lr61t8l0ujdj11dgvc8k5/22333455915.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/gemakawifugafadowimos.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0af2320a3a---zuwajugijokifogekuw.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/guruvigesaxibakifojakuz.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9bcb5d558---kedixelezes.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b16fec46d8---12609815619.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/tipuponaxatu.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/gojides.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/c5hlcr0j4mn05npo9nfcmmq278/88603739993.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/8448468865.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/78f52046e5455fa5f9132bda2378dd3e/besubuje.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/b77756d87cc98284305df432427b0fbe/muvifode.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/1458476292.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b88bc38c921---94998505893.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_off0000c5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E1 10772 bytes
SHA-256: 9a5f4ebecf89f0b35c8ce47045c908f324bedd3336053b7785c9ed1798227043
font_01_sfnt_off0000dead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 17288 bytes
SHA-256: 30bda5aab6fcb73f664d24db77c34ca17c8a35195a057c6359ff502f48483fef

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