Malicious PDF — malware analysis report

Static analysis result for SHA-256 69ccaea23a334313…

MALICIOUS

PDF

76.9 KB Created: 2021-09-08 14:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f5d699f101261f8f99ebffb6dabe0d92 SHA-1: fcc57e9509b2d7f287ecb4dc1e759e8bd52a49f8 SHA-256: 69ccaea23a33431343ab124ec45c935c7ca2c787e36d39307805ccb4d1839628
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 CMS uploads or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

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 https://whatproperty.ng/ckfinder/userfiles/files/rugobekelofunapov.pdf In PDF document text
    • https://oklogistic.lv/upload/file/morijotozuri.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/12356412187.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134231a968be---kumomanebevalibipaxokuk.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/wupanogejexigutinipisew.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/79409095782.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/31257428172.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/7c1vm9u6qvqptnolcvnavcpjcd/79774361765.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/78943661291.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/84818641855.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/18766495061.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/43aec36ee117512e43775c21ee3743e9/99736403695.pdfIn PDF document text
    • http://skncn.com/u/files/gajam.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/zekibazonumunajifotixej.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/wikexodejedutuxaravis.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/nojujorazezuxatetozojor.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/3251231470.pdfIn PDF document text
    • http://sswjeans.com/files/11105390179.pdfIn PDF document text
    • https://citronel.com/userfiles/files/kojutozemavogefawo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5d2jdqeig677i72ohmraa7os44/84716447295.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/52899527598.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/tirezije.pdfIn PDF document text
    • https://chineseclothingonline.com/File/63311722100.pdfIn PDF document text
    • http://scro.ru/pic/file/nazodam.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/mejimanoresufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=factoring+and+solving+quadratics+worksheetPDF 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_off0000c9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AB 16480 bytes
SHA-256: f3e0d644a8e923fa4db618625abacdd9056ca5279988c0bfbc8d709607e9d6ee
font_01_sfnt_off0000f3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FF 11116 bytes
SHA-256: 949f59690f2f02c0782d17c03a1c438973d5c74e33737960beddb04d7ba3c3cb
font_02_sfnt_off00010d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1