Malicious PDF — malware analysis report

Static analysis result for SHA-256 108c7bc858bd7f80…

MALICIOUS

PDF

82.0 KB Created: 2021-07-01 13:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0208bb9e6da544bf1a8fbbf368fa20d2 SHA-1: c321824ee78bb6bdcb5219e0a8dd0c27ce1e088c SHA-256: 108c7bc858bd7f80a935434bf170141045ca7493cd64d87f1a535c6006a84c3a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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.
  • 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://3bbb.fr/ckeditor/upload/files/kijuxabanupodi.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728cff40001---wukukotizatawajibakateje.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/0cfe264c196391c441de659792be567f/xesena.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819184ab65c---jakipiwot.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073839d8390c---bizepaxafarivagifagen.pdf
    • http://ceomit.com/fckupload/file/24256091629.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff4b612c47---47473692220.pdf
    • http://hainescentreasia.com/images/file/79575350571.pdf
    • https://eseninternational.com/uploads/files/pibateb.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/28b70822fd6299706f987384451e1aea/17849182662.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aadd2ddb127---visexepikulupox.pdf
    • http://web68s.com/upload/files/denewiruliwi.pdf
    • https://kovtec.pl/eurostyl/photos/file/33828474649.pdf
    • http://matstravel.ru/userfiles/file/vopenifotitin.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160757a5717f3a---jiwexovejalerar.pdf
    • http://bestbuyfromindia.com/userfiles/file/50084171231.pdf
    • http://artstudiodesign.it/userfiles/files/kudonusizevinobaxobofuvi.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/68829054616.pdf
    • http://garagehayashi.com/js/upload/files/selosek.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab67ae77827---lezipi.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099cf0cbdd7c---85766451485.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/p19ra05vv19h4k8fi4o9o12t28/1864133005.pdf
    • https://aartipalette.com/userfiles/file/bavasumuluzad.pdf
    • http://assushop.com/userfiles/assushop.com/file/24214710320.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=universal+gravitation+practice+worksheet+answers
    • 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_off0000d91c.bin
299f2fb6b779de3267513eed8a254a850211180c39c619565c5bfe2ea44e8093
pdf-font-stream PDF embedded font (sfnt) at offset 0xD91C 17672 bytes
font_01_sfnt_off0001077c.bin
21909ec166484c13026ca57f93caf474f86c90d81bda4d0d48fb20155446f42d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 10904 bytes
font_02_sfnt_off000120c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120C7 16792 bytes