Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc72e584bd322a4c…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 22:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 091f044e25dc2ec9fb1c7e3220986b1f SHA-1: af606de4eec5a034603d7f48476925c04293aea1 SHA-256: fc72e584bd322a4c58e788a2e5aaf080d86d6adb709f05cf23a23fb1b4fb6bdd
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many pointing to PDF files hosted on various domains. Several heuristics indicate these are link farms on disposable or compromised hosting, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution via these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://bioident.pl/photos_fck/file/dokefimepagepozatalo.pdf
    • https://yukkumpulgroup1.com/contents/files/mukaduvitolumakifokivi.pdf
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/wabofuxudoloriv.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/brlcb86ooht1f2geroqglhm0gr/mukeguponojo.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5990cbd4---jafimakeviw.pdf
    • http://uceng.net/_UploadFile/Images/file/duguzowisatilisumiwob.pdf
    • https://a2designbg.com/userfiles/file/zemuwefopened.pdf
    • https://alexandrapanayotou.com/web/images/static/file/tafapevejukosemediwimuxag.pdf
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/48466799313.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37c347055---vozomoxesuf.pdf
    • https://paperland.bg/uploads/file/kosewuxajofujolal.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094590b83338---74193845930.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/7802e0c0dbbdbbbe31a6e67327360453/ridabuguvoxakipegusakofez.pdf
    • http://daisytalavera.com/userfiles/files/jotizefazajiga.pdf
    • http://ji-tien.com/userfiles/file/68137554587.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/atltqkoj9iv6u2dpsgqf5crhq2/votivotagakuxuwup.pdf
    • https://peilimineko.com/userfiles/file/napexemaduwikomuf.pdf
    • https://novzelandiya.ru/ckfinder/userfiles/files/nurafolovurotudadu.pdf
    • http://aldobini.it/userfiles/files/xopubonipojugix.pdf
    • https://greenbins.ca/ckfinder/userfiles/files/genivumitigiruf.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1ca28214b---29149612552.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086b5a8063f4---sodoxewiximowufowob.pdf
    • http://altaprecision.com/userfiles/file/piwometenetezedamupizi.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d01357c279---kosoxinada.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=changing+fractions+to+decimals+and+vice+versa+worksheets
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7bf.bin
871b725cd6c503180431cff6114e59c5f860d28b34e581cc94d951944b311023
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BF 20692 bytes
font_01_sfnt_off00010c1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 16792 bytes
font_02_sfnt_off00012435.bin
2bfce6c7d1d8ef6a66f1af02f86917453b8d18d5c15ec8c9c908417eb736bfad
pdf-font-stream PDF embedded font (sfnt) at offset 0x12435 11196 bytes