Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81fb56bc67a121f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-03 16:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 59ec7f203a1609a20539d5aef601f8de SHA-1: 5d0f68ed87b259c7c698fa4fc4cbc5eb055413b3 SHA-256: d81fb56bc67a121fbc96ab2864244ad0730dbff11cd319c2967ca1df53f13db9
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user to a potentially harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://phayaotechno.com/UserFiles/File/dabiguxegumovavawuwezuv.pdf In PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607394005281a---fadokozokijegemevuwurob.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/81104521011.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03c131d4e3---texodugosoramebepavex.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612363f701281---97410184978.pdfIn PDF document text
    • http://unseretochter.ch/images/file/gigoxarizokadujasaziwoji.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/de85d839d76e9e67ae4e910f28f20b6d/fikadedorisaluzi.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/53046256287.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/luvalijofumuneninutogofo.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210821_082224.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b29c1614cca---46391906070.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/55964575352.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16082a6ea0bb03---60997826844.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ige6e4sim8k2qqiichpl7j72s0/nafagivimejurejudexixasun.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/c94a2130d8e81c23c9a0a35af941506b/gilaz.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210819013747.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/2483579355.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/baxumawan.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/56330519731.pdfIn PDF document text
    • http://uamarkets.com/images/file/wotawizifep.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9221b37217---56215690863.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc03c524b4---18793025473.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/jabojataposumivumuwavej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=philips+avent+comfort+manual+breast+pump+reviewsPDF 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_off0000d7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B9 16856 bytes
SHA-256: 470b91757a6838ac57e8031e99a84666117d87a76c2db3b960a1bac33ee240ff
font_01_sfnt_off00010346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10346 11136 bytes
SHA-256: e2c16a9782290001e7104453c7309bf2bdef74f1f28d0accecbc31ce24ab0370
font_02_sfnt_off00011cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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