Malicious PDF — malware analysis report

Static analysis result for SHA-256 da67eb1e6df41af4…

MALICIOUS

PDF

86.8 KB Created: 2021-07-17 15:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e156bfd63de49c0aeb0900b732ddb4ef SHA-1: 2f4b4ce2bdd86018a667cd6b15480328b6c0d802 SHA-256: da67eb1e6df41af465b76a540c31b377bd67802d9d9a164e3914b8f95cdb3ace
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous external links, some leading to PDF files hosted on compromised CMS uploads, points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d45d78e18de---nitunomediwilokakeju.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/98489ee520b91fe91987793e1cf1e6a7/76153877546.pdf
    • http://av-jet.ru/userfiles/file/20080162842.pdf
    • http://neodentpetrosino.it/userfiles/files/57000059667.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/2d8ljmi869cv7jbd71qpt55c4k/35541579013.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a00f6bec4---kunexakopebo.pdf
    • http://brezov-gaj.si/uporabnik/file/fazoxivudajexivojokin.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16083195703c0c---86455497619.pdf
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/sapufewupiv.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/c66a0ffa6543afdd73177a60b45d7865/gotebaxusilemetuj.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/kphekcssff4b3805ts208l3ap4/99918701187.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c417fc1c50b4e1f8c11ce0db88f6341c/lilixinoxuxarugop.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/5fabdadedb0aa553f04940d6a31821df/34796500683.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16086583554038---2280102562.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b53162e76e---xovonilananuna.pdf
    • http://tydafa.com/dafa/uploadfiles/20210625214345.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608aac98c3187---88259829428.pdf
    • http://doks-films.com/pcms/content/file/64357639587.pdf
    • http://indagosrl.it/userfiles/files/nolezesurazugofu.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160757e4f6aa7f---ruzusotagovig.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/7g782a801p93l9pcdakghm6ll2/1210539263.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/bad433dfbb7436bec333e61d7b9d3424/92071663619.pdf
    • https://erdenet.mn/userfiles/file/sazefaruvoxedepigorunegex.pdf
    • http://cherryontop.pl/upload/fotki/file/34570882583.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/2j10r71el9616n96bce7bmboi2/budil.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/be19dba6a9e4f84abc9bf746dcc70e30/69922460508.pdf
    • https://master-service.ro/images/file/24189780114.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=minecraft+full+game+download+for+android+free
    • 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_off0000f077.bin
5475f5acdcfc0d87ecc084257f64cad0f0afc7dc210a712fe73f827cfe509a81
pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 10832 bytes
font_01_sfnt_off00010949.bin
78f2cb19663dd79bbeed2e606561a25287d1b6a3fa1b878a054b41fbb1172a80
pdf-font-stream PDF embedded font (sfnt) at offset 0x10949 17004 bytes
font_02_sfnt_off00013587.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13587 16792 bytes