Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa045ad5aa82fb4…

MALICIOUS

PDF

90.0 KB Created: 2021-08-05 23:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b448da40f1e52916dd796b8200781e0c SHA-1: 77b946f60e3ede9450607903eedd37190d907f30 SHA-256: eaa045ad5aa82fb41ddce9529513bbbd0f3cd79a9ff0dbfb9f2874fe661107e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of JavaScript points to T1059.007, and the overall nature of the document as a malicious attachment aligns with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://nomylo.ru/uplcv?utm_term=hayward+navigator+pool+vacuum+troubleshooting PDF link annotation
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca204721dc---8540078197.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/49683057875.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/tamekukepa.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/41308077228.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160acf4cfa368c---pazile.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/goxovenezotujakasozijiba.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/83872967089.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210514204300.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/6rjo2gbsp6u8krl5e5hllj198h/13515919658.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071c813cbfbe---52197335845.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/73601937903.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/bakaginesododiwaxexur.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87c3ed5b657de17a6ee33f99181f218a/jawajewikode.pdfIn PDF document text
    • https://bataretak.com/img/files/file/rerenizodudowov.pdfIn PDF document text
    • http://kccmaul.com/files/files/62316391986.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/65807262412.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/duxalibolodixop.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe5b20f458---20319177602.pdfIn PDF document text
    • http://learningkey.org/userfiles/88270156290.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/55015677884.pdfIn PDF document text
    • http://adainst.com/uploade/files/20210626091736.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/95862060579.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/11683607746.pdfIn PDF document text
    • 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_off0000fb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 16596 bytes
SHA-256: dc6fac5735c0424bef48108b6ec4edc81d14239d39ad89ce0c13833c9d07b36e
font_01_sfnt_off00012695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAC 11456 bytes
SHA-256: 7cd029313e624c58d995744942c46da0b1811743531609104b55a4e61aeedd2a

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