Malicious PDF — malware analysis report

Static analysis result for SHA-256 4024513edf4663df…

MALICIOUS

PDF

84.3 KB Created: 2021-07-21 01:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a011597f61b0b63cdebf7c70bf07441b SHA-1: a9046ba03582cf93318b19e643652691bff0ff0f SHA-256: 4024513edf4663dff9815f3b04a92add546f0aa029d22b9c7f22c7c9f69b9fc5
164 Risk Score

Malware Insights

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

This PDF sample was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to lure victims. The embedded JavaScript likely facilitates the exploitation of PDF vulnerabilities to execute further malicious actions, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://biomedchita.ru/imeg_master/file/95827738327.pdf In PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/dfa140ee1919d64b99d6794eed18a8eb/88003345327.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/29999377802.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/cfe948130c4291ea046f48e4875eed53/11379950939.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607b554d8f437---3700996848.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1624a04a2---koparebogiro.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788659485fb---45319165302.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/vovusejosewokakifelo.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/tefonazinilixafifamamit.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb7c6de9da---46800279920.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2828d8dd505fa3b8916448670a5ea5ea/zagejigojamuvepiradutiku.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/9v5udqbfjl6qg5vp2196cci662/dufova.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/popizumumivusilebanovep.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd1c580ec4---rotesup.pdfIn PDF document text
    • https://cape-electronics.com/media/file/vezupifog.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/buzufezazoxilifot.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084299c50edd---vulewiwixet.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/saretipuniguwobunivulun.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/0fcbe198111d6ec31b0a046a1210ea87/41980323208.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/zepodulasuta.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/xuvanugugogetifujadobuj.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/xezenosolesotebune.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/fujama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=unary+operator+expected+bash+ifPDF 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_off0000e2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 18088 bytes
SHA-256: 594aa92e1762447f6165b24b7a8bb684504dc80f7ce0fbed3aa315b6f9ac77cf
font_01_sfnt_off00011295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11295 11032 bytes
SHA-256: f9c8012e5c5f79b761265e8d323bc4b85ba6a35c830efe439070d0774f4fa394
font_02_sfnt_off00012bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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