Malicious PDF — malware analysis report

Static analysis result for SHA-256 5202fdd75395b134…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 07:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 505f027d2c54dd0f9b423525a53bc219 SHA-1: 38bf9ee052b1f241ddbb5af5f52f70db760904e8 SHA-256: 5202fdd75395b134c6234e9f048fa8fa7ed317c2d049754d3754b5712a2bbc89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress uploads and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm characteristics points towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=drools+business+rules PDF link annotation
    • http://alimentosldm.com/userfiles/file/77648213481.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/salitelubozovefezapuzozu.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/3345624313.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/59f088d2ac9b89cd3bb284aaa8c82c8e/38048447048.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/43557538189.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/redabuvuvobuwapidekusodi.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/nezajoz.pdfIn PDF document text
    • https://aaaxxion.info/images/file/35332174635.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/beegqdclhs5q8kn5mm9h9ck657/gixetuvagoduxutugesigesib.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e34e85e441bd0aa09cfc72a766d5a48f/rilujigijifazuromiretiso.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/51090814145.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/84060135411.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/bef3c694ae3d9e4a420be6687d1e12b6/bogaxujuxuwaki.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/9300660534.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e77387ab---befefifodeb.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/59953852530.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/dufekedejixegap.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/3069841275.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba33f181fb9---96560778323.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e619f890cc---folinibefosomonekoxipexiv.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/08341e5cfacad2615ef56118b7f2d395/verelibopedexizujibimowa.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/24149276136.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/93912597253.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210602_132552_9969.pdfIn PDF document text
    • http://jucal.es/images/file/90894492523.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/dugedosunasunikuloz.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_off0000e767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE767 10084 bytes
SHA-256: adee3b2679ea6c820f7af17c9babd34233a948cc400bf8446f73414ceb41203e
font_01_sfnt_off0000fded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FF 17476 bytes
SHA-256: 0423142f2f03afc55ee1126f16de2cbf4efeea7699279fa0b36460d2849de90b