Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2aef992d44d9e30…

MALICIOUS

PDF

74.8 KB Created: 2021-07-22 22:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: cbfa63ecb87e8e205c6921f8bd941e5c SHA-1: b1265ba2425c2875ffb09a69d69c436f17b36b0a SHA-256: b2aef992d44d9e303d4c86b84cdcbfd2038eab47f1287de6b6052aa31f6f0bf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://kojeneckezbozi.eu/userfiles/file/39864960347.pdf In PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/70k9j616iif3prrf3unmb8td42/pinimajazanaze.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb083b8dd11---85189258631.pdfIn PDF document text
    • https://miet.hu/kepek/10857175668.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/jowat.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/62428152150.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/94923711923.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e3f46aec---joxuxopegepatigurizora.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/5662980147.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090dda5257c9---63397879030.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2d8dcdd93---90712245770.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69a2c63fd9---1624559127.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/69257103644.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/gesin.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/pevidafab.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1be2795ed8---tibititefitir.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccd1a9247c---48463754747.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a78e4a752ef---74406766332.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/42101ea84b04fa8f2411ea0b4715b898/49249201655.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/bovaguw.pdfIn PDF document text
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/23339579306.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/retudeduwe.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/roximowozavelunovov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=sip+cancellation+form+of+axis+mutual+fundPDF 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://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_off0000c700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 11056 bytes
SHA-256: 643b493bc1c558dfd86a9c5d0b5efb3242d48117ed7f29dcb3642c0363e3bcbb
font_02_sfnt_off0000f8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D1 15404 bytes
SHA-256: a2e911f941376173ca6d1633170286ddfdf46259a257eaee18f7fa7ac49b25ed

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