Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8dbd55a4d77f5ec…

MALICIOUS

PDF

78.3 KB Created: 2021-09-22 10:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7d8781047aa65e0a1fac62b2d5486871 SHA-1: d7f729bb644f693773021551940551da76d37aaf SHA-256: c8dbd55a4d77f5ece378b8ff5972967ce6b299cbef7903d66ed6659803b95b01
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of 'utm_term=download+legend+of+zelda+breath+of+the+wild+for+pc' in one URL suggests a lure for potentially unwanted software or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://garglob.ru/uplcv?utm_term=download+legend+of+zelda+breath+of+the+wild+for+pc PDF link annotation
    • http://cukiernia.eu/upload/files/20890584286.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/10555493095.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/xudesugax.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/budite.pdfIn PDF document text
    • https://luminex.pl/upload/file/58332645651.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/4147086676.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16149162b4e270---vumusopuzosunegomijufuse.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/pexudawimozil.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614457244a6d7---34339834833.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/bekazugeduwopu.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/67277486115.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/1508593852614542546d3a8.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/57083024395.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/filebeb.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/46844479015.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e119b50a6d04230bcd6dba87d3252903/suxevupozapimobilekanar.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109130257112794.pdfIn PDF document text
    • https://trexanh.net/upload/files/jumonawopiv.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109150611386698.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/91400243286.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f77ba6e8f1---datupuwigokedovagukipij.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/ce72d9913218ac5ec47b07293dce3ba9/xinejowexidupozunid.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/zogaxixugolo.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3e8211958---39565470780.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/fefebenit.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_off0000c9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D3 11020 bytes
SHA-256: 46dbb9a542d8543a723d4ae7436aea9009ced8a1deb8d4f7f3ae1b5d185f8014
font_01_sfnt_off0000e2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FF 18036 bytes
SHA-256: 95e0fa5a31d7cff5a68c610a00ec80bf868b6ac40474d0010059ebc768fe08fe
font_02_sfnt_off00011182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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