Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9a524b6f64d3ed…

MALICIOUS

PDF

88.5 KB Created: 2021-08-14 13:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c3e6afa6a38b9776e8e232eb1593c348 SHA-1: 1b38e8fb8929e449a08386a0c8ad2c197af7ac1c SHA-256: 3e9a524b6f64d3edc1feb2a8d9fbafdc0715e9fb42af50921d25524b5a88c8fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://share-world.tw/userfiles/file/24156043903.pdf In PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/42742c1cf50dd70a23d35ee0b1f87e44/46914158992.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789070d5b25---jedabufikuwijixoz.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/8ecd2d6f409ae71e9c5baa00a57292a0/56818498060.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/desebavokigexob.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/82097385051.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c43cd00faf---84360661924.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/kagawuvelenef.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c03d87035---mowek.pdfIn PDF document text
    • http://princeverma.in/uploads/files/57563773127.pdfIn PDF document text
    • https://labelmarket.pl/data/file/mefilawakiboribozikofod.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0086ce4b3---37842291881.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/65326234735.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/45741466028.pdfIn PDF document text
    • https://abeess.com/userfiles/file/6310252605.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/nafosofozelipabubelu.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/3015193351.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/06e74f1a43fcff7b29b8d366d2d251e7/39221627462.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/mosikapijodapan.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/32238181586.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/wibuwowadakuzomesetanam.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6338c3e069---lagagazatikavelaveretosa.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/bipemewugixujafixovoxo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160e63f7e8b93f---luwes.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/kavemitedal.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/20663799448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+in+hindi+season+2+episode+18PDF 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_off0000f842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 16332 bytes
SHA-256: 93b98d43144c9210ad93315fffab5c75d1b0fbeea619ecd39047f06e1ab65bab
font_01_sfnt_off00012235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4C 10884 bytes
SHA-256: 0bcc9b15ac226709ab0d98adc99724719aa253244c4e1c8fa7d2c22fc5ad8783