Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1ff1b425b41153…

MALICIOUS

PDF

68.6 KB Created: 2021-09-30 16:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d85dfee9abb30a54aa201e09cde90e4 SHA-1: 28b00bc5e60e81433f7d42c07c992a0b9ca5a36f SHA-256: fe1ff1b425b4115356886d001a75bb1e2be6e3c9e7dc1aeb7374303473be598f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or trojan payload delivery. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the document, likely used to facilitate the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://infrive.ru/uplcv?utm_term=star+wars+live+stream PDF link annotation
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/25653884076.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/49048812613.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/25067108817.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/bamerasotojomef.pdfIn PDF document text
    • http://th-hl.com///upload/files/reluxoxel.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/91a302d2d1bff4736494a1af0b7c6eb9/9225472763.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/rubafutos.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109061805105203.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/61136600592.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/11672428878.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/58589777296.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b40ddec48a---759122483.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/gususakenulopotenejijir.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/mafubuluvubef.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021922150199772.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/lepin.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/wukuzemalatufozerufovazi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7c674761d---zuwodudit.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/kivupipeledorufasupoper.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/13229760282.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109021806348082.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/19029150803.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/27301534545.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_off0000b195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB195 14448 bytes
SHA-256: 6fab0d679e47a7c56e516c3f30a0b7816de90c8f2205981adf276c5f02835d38
font_01_sfnt_off0000d5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 10272 bytes
SHA-256: 29bd92c60cebe10aa860879e819d2385560ccc550afecb9e939b026121d60109