Malicious PDF — malware analysis report

Static analysis result for SHA-256 da63c8524ac5f688…

MALICIOUS

PDF

89.0 KB Created: 2021-08-10 05:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ee2d59fdd73fad1b6582a3bb8bd1d220 SHA-1: d110bb9c0cf767739df2c66c947a045f284da2b1 SHA-256: da63c8524ac5f6889398514465694f757804684a066c36f77ceb807ea873e09c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to these sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the finding that this PDF is designed to distribute links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087a33183b1b---nenevo.pdf In PDF document text
    • http://bahattinburyan.com/userfiles/file/sasesemutipide.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100060133bb3---weminos.pdfIn PDF document text
    • https://papiratisk.cz/soubory/sefekefezorezinujozodo.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/69647711657.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/92ca146586aed160fd477f13a0fee85c/61780129505.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/pusaxeseb.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/96e01abf5d08d58130c312b78465f21a/69094428261.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/pudodivovofefotunolaxal.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/49108980410.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/rowurolovanofaber.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a63e71bb8e---61711458930.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbef60379e---xagiwipibe.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef82339b26---kabopuwanasasiwutupivum.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/9fg3hn1lecb886795ka7gac1f4/95609978686.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/xudapipi.pdfIn PDF document text
    • http://mobilenmr.com/files/files/zodunodapisobuvevanan.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095cda718330---ruxipifopob.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/mijiwajizopax.pdfIn PDF document text
    • http://peak-experience-japan.com/27166192429.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984d0a5219d---mevivuboliridusofetesug.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/a509123196afdb7f6a5a9e98347bd212/futogepujunibidetudubole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=can+we+use+purposive+sampling+in+quantitative+researchPDF link annotation
    • 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_off0000f576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF576 11248 bytes
SHA-256: 49d8ef0f6340017f5e8d15733f10e181abb191c0f0c8cd8b7cdfd8fc86ed7651
font_01_sfnt_off00010f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6C 17576 bytes
SHA-256: df9b17763224a293d81f06151bb7b7ad45fac36a259a2f8bbb9e65702e204029
font_02_sfnt_off00013d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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