Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03436d9c40679d8…

MALICIOUS

PDF

86.4 KB Created: 2021-06-26 00:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8047893379d438270d428316d25576d7 SHA-1: c126302621ee70d51e02ad6d481379aaae85b670 SHA-256: e03436d9c40679d8fb985a17e52496a14d748c6fa69dde64d1159f5902c3fc29
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress sites and disposable hosting domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://zlato-eu.sk/upload/files/ropawonu.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0ec43e5dc6402ae13fdaaf01399992e2/22102956989.pdf
    • https://almuhja.net/ckfinder/userfiles/files/wubojopolapofa.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/93c6ffe6f432a52fd77d73060370a6aa/rejakejila.pdf
    • http://lnianemarzenie.pl/userfiles/file/xijinibetoke.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/61055174821.pdf
    • http://maslatalaia.com/userfiles/file/mesukubalojuxoparoganop.pdf
    • https://sonntag-immobilien.lu/userfiles/files/12356046717.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/5ec69356336e5199780034f32522047a/45720210073.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fce46c17b---95531885691.pdf
    • https://nnt52.ru/userfiles/file/17893416625.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e3fd33abe---libufix.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d143e22748---5043210408.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/45c75c9b1000cdd0dff228a44bca7b4f/pufenepupodejo.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/0ujgv20esdvbc5ovueu1vqgldh/52490619642.pdf
    • http://drentmedischadvies.nl/uploads/files/80709800784.pdf
    • http://shinies.ru/img/lib/file/60601532061.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/7044386a97127625404aad2a9fade57b/gokilunaxigebetixegenofo.pdf
    • http://naturabliskociebie.pl/userfiles/file/88118124860.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6b6dad18---nafiladalugemalazoxul.pdf
    • https://kitapkapla.com/upload/ckfinder/files/fexawadedopewotononosi.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/79eqral4693r7i0p3r37m5gdok/vapof.pdf
    • http://lakehighlandsrw.org/clients/863582/File/kelugowurodavotone.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607190e6c1fb6---22300356934.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/27989091938.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=monster+legends+how+to+breed+tartarus
    • 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_off0000ed7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 16792 bytes
font_01_sfnt_off00010593.bin
52ff8d9e3123b9e6069544ee674e7ecc6f39ce3e90f0603b73eb08e95bbd47af
pdf-font-stream PDF embedded font (sfnt) at offset 0x10593 10752 bytes
font_02_sfnt_off00011e1b.bin
1e14a57121ea3cc800806db4acc59e88bf3f6cd1511d3f588e74c353b0c3b198
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1B 17456 bytes