Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9ce574bb65115d…

MALICIOUS

PDF

84.7 KB Created: 2021-09-03 13:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e89490e4a17fbdb53c691b891fb4a482 SHA-1: 84bbfcb1c826eb7df963049eb464478b4372731d SHA-256: 2b9ce574bb65115d45557cf12f4c52fa169ce068d4f5c41a2b836e764ebc64fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malware or phish for credentials. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c63b4fea4f3---tigomedija.pdf In PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/lutitavebege.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/kirewimifoko.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/1336581400.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/m9d00gl8lfrraagh0vqs8asa7l/loxefura.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/sexoletideveworox.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/dipivatogofesigiw.pdfIn PDF document text
    • http://pololanna.com/user_img/files/68232188884.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/gizan.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d157526f2f---70634323888.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210811_F5618B4A0F33848A.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/kutito.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d166c3a2ff---61167732793.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/44151575331.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/82649113059.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608611a39e24d---11544684922.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f734776859---xesuwaperumezim.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/2936363719.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/2aa4064b03bb7a8ace2c25a32f05148b/57438925867.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/fosadudiloviwebaxadezim.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/vfkp96huajer9rpjbg93udgie8/gibuva.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/70483097098.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/261c7bd7a2bb42f65262c610100bdc8d/bupolakunibelesud.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/tugufotumuluwuraxunik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=song+from+a+secret+garden+piano+sheet+music+pdf+freePDF 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_off0000e205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE205 18584 bytes
SHA-256: 303248798d7d85eb07af46d7e5efad7bb249590068056a45fb38dfd9d65e6897
font_01_sfnt_off00011283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9A 11196 bytes
SHA-256: bf4163dd5f1bf29a7597c22d652aa90bf908e886a2843f85f9c12c17a3e4076f

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