Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f30edf001880d7…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 17:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 19dfc469edf78b28f9e4e74b55f01345 SHA-1: dbe8504cec1a02278c850d8c981a78d51f082f69 SHA-256: 13f30edf001880d7e5188fa1678c51faf8f05fe3989bdcd8391c4eba1a2ee13b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, with several heuristics indicating a compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hkwwta.org/userfiles/98667898925.pdf In PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e57d1ceddf86c5580eaca50c3baa9d81/vibekuvuwi.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/sefivo.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/selagezonudisujuvulemetig.pdfIn PDF document text
    • https://e-room.co/userfiles/file/fokuloni.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137914284acf---26300157880.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/3325586938.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/gutonure.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/domixuxuxomekujoxidulok.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/57853671342.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/babesediwezo.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109170916093598.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109131448469261.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/14589010531.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/3293583914.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145ab9e334de---60468897298.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136029bb8c95---xogofe.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/efc2f2d59b47cac72800fe420610784b/binikuwetapo.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/jipabapukuwizuvegiti.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/d3cdfb86a91e66d5d07c8b000bf76e19/josixodifelijemidoxet.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/bowulunafir.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/40813761622.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/31200326018.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/sovaxitud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=my+hero+two+heroes+onlinePDF 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_off0000d139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD139 17384 bytes
SHA-256: 7bd4201578cb63979489bbe02d23fdee15bb9cded77468551d32f44579462779
font_01_sfnt_off0000fea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA4 10236 bytes
SHA-256: 604c402a26b99fff83e21823cd2546828142af517160c3446f8a7917c48bfa91
font_02_sfnt_off000115a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1