Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89cdc5a5ca051b4…

MALICIOUS

PDF

73.4 KB Created: 2021-09-08 00:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fdc8a607e4998d0e89fb9ad01d923c00 SHA-1: 5c513cdf52864f96e126ed39536e35242465e5d7 SHA-256: e89cdc5a5ca051b468ab1c5bb0e450d27ed89f16790ff802fe261a9d96a1ba2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various domains, some of which appear to be compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://afghansolar.com/userfiles/file/lofokugakijoterosotuda.pdf In PDF document text
    • https://thaiwoodengames.com/files/upload/files/62908832356.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/lopuzutimobifit.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3084392f49---90411389855.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/gofifokagenut.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/jafoxodesesamaripijub.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/f4q0o3gg1h3kbtnfqm01vru8j1/31357022073.pdfIn PDF document text
    • https://sce.tw/uploads/files/60e8486f48c99.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/863e76ea86476b1680a9aa2347db3bc0/40324844970.pdfIn PDF document text
    • https://wrd13.com/force/file/32685332128.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608f35f92f910---17187695263.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/lapinizatazatepupuxagune.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e2cb3db0730---jijapixo.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b1adb8ef92---11806641327.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/55475715528.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/4lkfqhm8pqffr4a3b17rsp3iub/87810387485.pdfIn PDF document text
    • http://synergyproperty.com/images/files/9627328902.pdfIn PDF document text
    • https://susta.vn/userfiles/file/35280284306.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/wigitijibomanaruvesode.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094b98fb2ab0---wetozirewupero.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/77190934856.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/xusudebaxa.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b470225de1a---73311586163.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/vu6dvr6mstvh4k158oe0n2ucgg/saxisegukigewisuwab.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/mivugodanokugenafabopeso.pdfIn PDF document text
    • http://flexicourse.cz/res/file/83158319019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=antagonista+y+agonista+pdfPDF 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_off0000bcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCEA 10492 bytes
SHA-256: d4b234ba140eeefb6e570bb6652a64316362aed02e0bb39e632120e61d4cb3a1
font_01_sfnt_off0000d4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BB 17224 bytes
SHA-256: fa17a7b15d0f379da119d1132813cb76b23151a42925df013199bd121d35806b
font_02_sfnt_off00010000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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