Malicious PDF — malware analysis report

Static analysis result for SHA-256 c903850dfbe0927a…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 03:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 385da22cf7dc3dccf0c1a81333955110 SHA-1: 8ba5f72943bbc00379000e024fbef22f5a533937 SHA-256: c903850dfbe0927a9c368b67b61c90f24bc2df692589df4dc86edcf6b051ef73
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://rajatotogroup4.com/contents/files/2203986138.pdf In PDF document text
    • http://kokocurry.gm/userfiles/file/47447880132.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/698665f2a0f4c5e4bf8e1a02be97d006/rulaleromuk.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160aacee1acb2d---rebuzigodugikukajime.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c82ab0da2a7ee7b5cbf2e5efdf127c9e/xitubatitumabimekum.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/kuzokusunekopebidiburepo.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/546eabd7c370e08cff5c6784b9c9df93/33051472818.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/98460757752.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff77a86b0b---saxuvapogenitofenunesop.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/46041416933.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/bulesenifekumifefopovax.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081700680a3a---nogedojozi.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/71897178094.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/pumuwukolipuribefozo.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/biwixedadewomadexeruka.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210517102620.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/85057181275.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/62262a3be51f9a21749663cc53df8034/fitatejefoxawo.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/xofaluzimewanowisaxuj.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/47544243761.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/98133275554.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/pghdnlk3vdpdtargr08g9qq96d/3933776693.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/tofanog.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/7792e263f0bba5403a40b6d8f210f4b3/83256243950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=drug+abuse+resistance+education+book+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_off0000d14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14D 11080 bytes
SHA-256: 132496bd098bbed887538d4b75868a1b5beddba37a8aad29b52ae6f5297e7383
font_01_sfnt_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F2 17072 bytes
SHA-256: 880bb7a308ee957011dd1f64e7ecfe4c8a42a8113787c3f7babdf2840ce6cc55