Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61c2069226d82a3…

MALICIOUS

PDF

84.0 KB Created: 2021-08-19 14:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7d6b51e55d43af1448c36c61980dc954 SHA-1: b7eb4ec4c8b742d4fa961059a74e78eaef5f470e SHA-256: e61c2069226d82a3f52d921e9193263b630a70182c104974598a3a3dcdf8d725
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The document contains a link farm pointing to various URLs, some hosted on potentially compromised CMS uploads or disposable domains, which is a common tactic for distributing malicious payloads. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a technique used to evade initial gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://driftwoodcc.com/userfiles/files/28456643286.pdf In PDF document text
    • https://nutstudio.it/userfiles/file/kotokofimigulefolijipodu.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078234a8ef80---faxufivusavasafaduk.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0010023001619859979.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-12/20210612152607323419.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210706_6B212061817674C9.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/97946466978.pdfIn PDF document text
    • https://bloomeng.com/uploads/88062763821.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/28641056712.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/jonedufimorudomupel.pdfIn PDF document text
    • https://educhina.mn/editor/files/lazozozeziruzuk.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/b170984792537f31a082598ce8c04cde/56224007027.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0efd0b609---gigonibetejepipujubafepo.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110e75691fd7---8315597944.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/buviviboru.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/81956582061.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/64273193761.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210619_C86A2B0C9E8692A1.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/9777ecf115ab67934c96b22df167f9c6/kozolapefezo.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9753e94ee---99436175492.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947d4d54976---nepidurizomibovog.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/xizudad.pdfIn PDF document text
    • http://ipceurope.com/assets/file/8953189300.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/betugujiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=uniben+admission+list+2020+pdfPDF 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_off0000e39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39E 16892 bytes
SHA-256: 240bb93e936d7c6f634bb631b666ce4e46e87d664605be834d583382e0af4caa
font_01_sfnt_off00010fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BD 10948 bytes
SHA-256: 0ef46e048e9943670111b260cc8b32c8d3a9c73b427bcc8c4bd3829be0a4e400

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