Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3eed6f7dff8f643…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 01:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78b2d68e42c04f670c490b4e414e43d3 SHA-1: 0f9a47a26a4831be722b00b3cdfea173829538f8 SHA-256: e3eed6f7dff8f643ba6f338a3ea3e55af12f34c8bb5ff5b1fdb415acf008a18c
124 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress upload storage and other disposable hosting sites, indicative of a link farm used for phishing or malware distribution. ClamAV detection further supports its malicious nature, identifying it as Pdf.Phishing.Trojan. The document body is heavily obfuscated and unreadable, preventing a deeper analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3358

Heuristics 5

  • 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
  • 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://beldapromosyon.com/calisma2/files/uploads/31752195869.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160917b3c01e08---9819670715.pdf
    • http://theclubburger.com/uploads/files/51892816217.pdf
    • http://animalscipublisher.com/files/upfiles/file/sizetexezobilamo.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/f734e48f263d39067c62e592c89a45ee/xuwakidabafexe.pdf
    • http://actlogistic.vn/upload/editor/files/vezalowanadekuwefumori.pdf
    • https://santa.my/images/users/00000000/files/75998659468.pdf
    • http://akcjonariusz.com/UserFiles/file/fotivu.pdf
    • http://straps.by/ckfinder/userfiles/files/tomikivejitenutawidisaf.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/tiwitatedajodudezotuk.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160790bc864a71---peranuvijowoviluxat.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f63cea90e0a7b081c6b5827eb4d6bbb6/wokatasowapowuniloponaz.pdf
    • http://detaycopymatbaa.com/userfiles/file/10238176959.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8d6ce6447---80933855978.pdf
    • https://twr1115.net/files/fckeditor/file/11720503062.pdf
    • https://salvatoredivilio.it/userfiles/file/74394868183.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ioen7m6d5p9cd46q44ol2ib3km/saduroxaka.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607505db48e9b---ziribivonufimaselafij.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/84cf48ba1e8b3c743d85d71b0179ae79/52816121091.pdf
    • http://martonaroniskola.net/userfiles/file/tefimonozo.pdf
    • http://schokozentrale.de/idata/70247194642.pdf
    • http://exdebt.bg/userfiles/file/bobelixisejolokugepufeg.pdf
    • http://zxsolar.com/d/files/16295656620.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=luxation+de+rotule+pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101B0 16792 bytes
font_01_sfnt_off000119c7.bin
072bc29bfd9b3af92f13f157a49f9b578edf07cc1fd19db47e50cc0f9996d160		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119C7 10484 bytes

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