Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e82c1c6a75067ab…

MALICIOUS

PDF

78.8 KB Created: 2021-09-05 19:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c476e18e295eddf1373d5879378ad724 SHA-1: 5ee208d58cf9760c8ea80f35ce74b3781037a00e SHA-256: 9e82c1c6a75067aba0d4d5c866e7aad2708414bbf2312c56d9ce0ba89d077803
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=present+simple+practice+exercises+pdf PDF link annotation
    • http://auksozvynas.lt/userfiles/file/xufizatamefovopuxitutaxi.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/62684581123.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16074cee62b378---740983331.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/of2jptp1hv3i95ihr75jfa57r6/32239772674.pdfIn PDF document text
    • http://runo34.ru/attachments/file/livezaje.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021060606423173499.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/wolarefaza.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/32897486264.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/85108507422.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/32210525530.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/84130906990.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/dazezibufipulovinup.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612781ac7db84---71644560423.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/71474666654.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/45568294755.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e69e98c34---25488914041.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/bozopedovexoro.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/nedukowubesirakedox.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/tanifexezerojimi.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160865a246c836---juzizanezifiwilumizitag.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084b08e96cc8---sikisabubitizakoti.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e036ba96d96---900071099.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_off0000cfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FD 17296 bytes
SHA-256: ce2a55a86e1496949b48c438bff9aaede67b40615fc5941fde9ac05b9edbf9db
font_02_sfnt_off000114a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A0 10764 bytes
SHA-256: b99d0e4262252880d430eba311f3fa2d7237c987d5312b1653d33a71c36af69a