Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e103797acf152d8…

MALICIOUS

PDF

96.5 KB Created: 2021-08-01 03:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8f1a534bb0faebb9e86d08b24b47022f SHA-1: 764188512d89206b77ddb90e88a383c559622236 SHA-256: 3e103797acf152d8dd1c8508c3606c591d90d03c0ac133f820a90eb39b0d3deb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JS, though not directly executed in this static analysis, is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7e2bbfe87---57204333578.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906426491b9---gibelusabudugo.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/c8851402af484bd80e2e7664d8d5ccb6/2601398933.pdfIn PDF document text
    • https://reinigungsfee007.de/wp-content/plugins/super-forms/uploads/php/files/dil4j8dksrl88ksl24up1t330c/jazufoja.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b2a33dcc---padekawakexanizemosuta.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16081c1b053b05---26416518806.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/36057769540.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/xatot.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/bba9ff884b086098d71aa1462eb8c8fb/5346028797.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/pusedanolutusili.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/1391d5256dbefc519c46a9c6b45f52b5/61830606216.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///21351604354.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/pg3vg89dvqbp0qgerdv5oqmjqs/wefimamabo.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/8558951689.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/delixanilefokeral.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/c455de7dafb91331c083f182591b4ff9/sasotafinituzubetewuve.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e63c168551---18981815163.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/lojenutusuvoluwuzufalef.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/76eddb1fd09745427f1ac36181b065e1/40399724043.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929ce113c2e---xenevajusizajeb.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/rakopifu.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/zekazadoniwojino.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607355b55a82a---48616326103.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf1f4edcf9---94989951634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+reset+honeywell+vision+pro+8000PDF 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_off00010fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FED 19376 bytes
SHA-256: 47455fe454c29da0e80df23466e736e98fa63d039667477f46542cc1ead73f6a
font_01_sfnt_off000142c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE0 10776 bytes
SHA-256: e58573e8b7861f7c16a546f437b642115d97ef3dbfe5e1ba99c2fe99d85c62d5