Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb937fdef7117d80…

MALICIOUS

PDF

80.4 KB Created: 2021-07-01 12:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 182a4918e0ccd5a4dae13700830c88b1 SHA-1: f1c27cfaf930f09e68a71757a86c6a71163cd987 SHA-256: eb937fdef7117d80f431c807dad8446bf768bd912cebed2abecd725a2ec06dc5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable binary data, but the heuristics clearly identify the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/c98e05633be4d1608d9947f6795ad4bd/xabagonizamuvivuwimoviri.pdf
    • http://nesthomes.in/userfiles/file/14692869296.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087706ea778e---98890251875.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/dt9ocacmuja8gaq743akuuuqn2/nexed.pdf
    • http://bangdientunhk.com/upload/files/22018273153.pdf
    • http://gesundezellen.de/neu/userfiles/file/7102324806.pdf
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/f031885fa2b86145b36459786509b86b/zavuwugometame.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/4fce0d87fdca2d6de213f88e3f6db327/bulajadaso.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/5f1f19d84bab2bef7e8b37a42a6f3892/pesajuzakomu.pdf
    • https://efnnma.org/files/file/38327652706.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732d042ced9---fexefo.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j0doqu1tc478b5a2fc9g0aerh0/danib.pdf
    • http://presssimayeshahr.ir/pic/file/fokigulinogarazewudepos.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d3095909cfb40625088e6cb33b75eeea/wofif.pdf
    • http://designbeginnings.com/upload/file/nizanefo.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f023584a1---65034173649.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b8a135f62---wowedukesanomeriroxiz.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090e01934504---71303474261.pdf
    • https://classconnbio.com/img-jacson/files/87268705752.pdf
    • https://topinsolventa.ro/userfiles/file/biwarevibo.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/9b067cb629707009be43918451d21ed9/zidokerabawetoninu.pdf
    • http://adabaskimerkezi.com/upload/file/fojelekopetazutita.pdf
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/xawupovedoviges.pdf
    • http://shosholoza.de/file/jojeveruliguxaza.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=national+association+of+sales+professionals
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d656.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD656 16792 bytes
font_01_sfnt_off0000ee68.bin
6e62ac74126337134aa2fab0d9aca0a9303ddb51e8e06fabc93b44bb7a25a356
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 17408 bytes
font_02_sfnt_off00011c57.bin
2335090951c03830e0c2bc6fd6d25a8dd55aebfa798e32e43d3bd27935150b34
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C57 10448 bytes