Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3bf23f24ba0eef…

MALICIOUS

PDF

82.1 KB Created: 2021-09-15 15:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 94c8a23524997c953f34c958c016533c SHA-1: 6a0f6d962c7b0005a2308772bc467ee1c94bcbfa SHA-256: ce3bf23f24ba0eefacbf88d73ba410b724373d7026d9b24ab0484f31ae5c3c5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on compromised CMS uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=software+update+android+9 PDF link annotation
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/fc4e44b7c1ab297f7fa6debfd0f09f97/rifanixaxunidawow.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/71550908808.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/vizubi.pdfIn PDF document text
    • http://bibikid.ru/upload/65823086950.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16139550c91e9e---kazewerinegov.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315ba41068b---pogagisiwafiviberovuk.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/53268059603.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/68648552833.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/lajezulajozita.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/sewopujozebesuti.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f97f07bf09---93943827608.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/23814318897.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/9646017520.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/61726576900.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/ff3e3ee6ccfbe970d397836c2a1f3863/teziv.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/95500346250.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/wugorokexutitutegofufebix.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/35823409638.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/bideta.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/86418506981.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/425a4a3a7c73d2503e644ba60a2cf14e/besujasep.pdfIn PDF document text
    • http://surestegc.org/documentos/file/gobubolemilitokivojakupow.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/81761935858.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_off0000dbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 17632 bytes
SHA-256: 65283394963deacc924a5a6583a710ccfe5c798892e8488f291e8a33f6c28bf0
font_02_sfnt_off000121fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FD 10708 bytes
SHA-256: c1cfa07501f69e4d4cf33af2317d5d7c8580dadc14588c968668125a99366f21

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