Malicious PDF — malware analysis report

Static analysis result for SHA-256 976f02d3c8c047bf…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 04:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d06a0563a6ea53885e23c7c11bbd4028 SHA-1: a936e85a69e9886f686768da41072fb3a2fb73d0 SHA-256: 976f02d3c8c047bfdb6f37c376a570d9d5c17bd27cff68340351aca7d19e80c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=hi+poker+3d+mod+apk PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5bfdd8966---pedakafadajesosub.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/rolinizavepuwuwem.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/99666431120.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/75786959766.pdfIn PDF document text
    • https://bselink.com/userfiles/file/56306879431.pdfIn PDF document text
    • http://handgun.ee/media/file/81086732631.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/davomewe.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137dd0a08db6---31408808027.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/66474588245.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/xefitoleziwukudunokopapo.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/49473246069.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/mizajagogoweleviv.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/96579381442.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/zigonilazufugesuza.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/67117245550.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/37954470855.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/jiniwigu.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/19660926495.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/80685855178.pdfIn PDF document text
    • http://fygl.net/uploads/file/060923293450.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/benemomufekoxovizelimum.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/63267951779.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134aef4a3b95---wuzunuru.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_off0000db1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1B 17916 bytes
SHA-256: b31ccc8e3de3b0998779cf78307d0e07cb45551527c76d3b1727aa8ff2c32bd1
font_01_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 10392 bytes
SHA-256: fff556ac8edccaba0872eb84a9321f6605123ea9a46fbc27a3ed7dcc1ef3d4fe
font_02_sfnt_off00012180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12180 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1