Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d53d9e8665d6fb2…

MALICIOUS

PDF

74.4 KB Created: 2021-09-18 15:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5f695ee9f4323aba7b1f9061f0f6928b SHA-1: 23e906d1c1efbc11010f0849439a410114ba1b61 SHA-256: 5d53d9e8665d6fb2f9f5021c41b9c179766e7fbc2369f56591148c4c267941cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristic firings indicate a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://inwebjor.ru/uplcv?utm_term=media+player+for+pc+and+android PDF link annotation
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4fcdbc073---bimunuluzuj.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/64803344058.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/26532803789.pdfIn PDF document text
    • http://sdes.in/uploads/3333883815.pdfIn PDF document text
    • http://potlista.com/file/files/revikamikilimilen.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/wesebizaluv.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/57826324576.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/nemopepazuxusibadawodi.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/7pr0udr9glomo3194enrec5ir7/85596852652.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/kobesinur.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/41489704216.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/xidarafelirafumuzunanam.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/69772624880.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/48697141930.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/2824970715.pdfIn PDF document text
    • http://sdes.in/uploads/85218353424.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/jixejekidaferuxufex.pdfIn PDF document text
    • http://elpijisystem.com/file/debalika.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630736553.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad746ce47c---60676137015.pdfIn PDF document text
    • http://katela.net/userData/board/file/kinutigametomi.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/lojelenukupidetowesuv.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/26001495039.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/wuzosanawigowu.pdfIn PDF document text
    • 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_off0000c113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC113 10452 bytes
SHA-256: 7068606397ca36cb375a28f41d08bd8a6f15eeedc92ca6750a0dad0148d7c77f
font_01_sfnt_off0000d8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DC 16852 bytes
SHA-256: 8ea86197eb9caaca2446f1ec06dedbce40c7bb183dee733f8128f5e4f7636dcc
font_02_sfnt_off000103e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1