Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3106883d3cd685…

MALICIOUS

PDF

68.8 KB Created: 2021-09-06 11:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7e588a00b26d5dd60c2e6b9e2ea407a7 SHA-1: f78aafde8e92d467b88dacc5f225058cc49089e0 SHA-256: 1f3106883d3cd685c7f221e90d632201270c780de4fdbc89529d42b41a91ac86
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, indicating a tactic to distribute or host malicious files. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous external links suggest an attempt to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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 http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86a8c88b94---nagoxabexepegisoporoxo.pdf In PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/394b42b8f2c72f09b8865006cb9fd9fa/nedopalefabokoparako.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/13330409617.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/kozajetozapedarexu.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/wilepiximabim.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/85566072483.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/puzajeluvevumebegelu.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/0e2065580074510f45ded1953a45e751/geriwifezakipagovawaj.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/42729970838.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/66556697437.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/73252354715.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3339eb8305194657876159e02dc1d3f1/wanefuwojegipafojixesa.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a98c999fcb2---zibofobumobup.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f8fdd4875---weparozenoxixubaze.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e28dd16badb---sokewe.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/18ad9864971dc9eb4f76caee2f072fb5/sijila.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/samilupezugi.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/64ae0acb6b57aa085ed93aa01c3714d6/karirilu.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/goputularap.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/34371271220.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/24001463735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=scientific+books+download+pdfPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210904/16307273705824.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_off0000b035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB035 10908 bytes
SHA-256: 5061083ec605b9a46d86120c963ae5b3096085d5eb4b172558185d5f40fb96c9
font_01_sfnt_off0000c968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC968 14604 bytes
SHA-256: 687ba43a5e86dc1eed0231752ab7ce311a511d1fb3539d3266d93b93603b8411
font_02_sfnt_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1