Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb6237b7c9a0a05…

MALICIOUS

PDF

76.4 KB Created: 2021-08-14 01:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 3e86b202eac18bfb892e4cfec4feb491 SHA-1: b5783621cc187802240394e4c03e65d798c0c4b7 SHA-256: deb6237b7c9a0a051d924ee23e17b5f74cdd15c932de89826567aec009153149
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external links, many hosted on compromised or disposable domains, strongly suggests a phishing or redirection attempt. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://kiuruvedenlukio.fi/tiedostot/file/51823467065.pdf In PDF document text
    • https://trimix.bg/UserFiles/File/fewarixebezuw.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/3f3f610fb7e0a36bbbe464f6085f61b6/3336925424.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/koxisofokunavovabin.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a1ce5a10152c055dd70d1b876040a972/foxozarupizulu.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/liboxerumuzunaxutu.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/jajomifepawalakakiva.pdfIn PDF document text
    • http://limoride.net/gallery/file/sodedumagepevoloziposuk.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/jagakekasanusafudi.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/wifabalal.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/52sp3gkhk9o8fa4r14l0sm2dhp/1826928548.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/57233270697.pdfIn PDF document text
    • https://service-panev.com/userfiles/zekonubenamufajakuvu.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/fajopo.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/3683533230985baad7ce1c3239fbf615/povijusawesowedejisap.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0dd877153---vofojumurexuxizesejixifej.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160825f0933cf2---15906172602.pdfIn PDF document text
    • https://ms01bet.net/contents//files/rajovisutoxefazimojuveput.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dd83a9d947d---rokidowonojogedepa.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f5c011693---konivuwure.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160928c4c9da14---48219068444.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2105260823533690512nggg5.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/ec71ad00ece55881e7be9251ebcdc05d/26163549742.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/57722164364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=introduccion+al+dibujo+tecnico+arquitectonico+jose+luis+marin+pdfPDF 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_off0000c489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9B 17328 bytes
SHA-256: e4d43b471aeec70e281a9e7d99da2c6dceb2d302a59390c6f3c0a576de5f4e9c
font_02_sfnt_off00010895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10895 11248 bytes
SHA-256: 22eb385af1a4d923b7ccf54078d7f5e39c7a0eeb1a89629071c969d163ded7cb

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