Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c456f3ae4f1758d…

MALICIOUS

PDF

89.8 KB Created: 2021-09-04 05:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b4b2aaaa371c88c18f0b3144132de7c7 SHA-1: 5c1b8d240ac24ef3efaf116fb4ba692901fac11e SHA-256: 9c456f3ae4f1758dcebf7a97bc0ba7d0f5454298056c415d159d1c7e08b029c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and links to compromised CMS upload storage. The PDF likely exploits vulnerabilities or uses social engineering to redirect users to malicious sites hosted on compromised infrastructure, potentially for phishing or further payload delivery. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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
  • 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.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c7e6d3d36---28124953025.pdf In PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/8f2f0a222aa2e950a08238d442480841/zepitaxegevifeve.pdfIn PDF document text
    • http://adice-area.com/pictures/files/73763928614.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/bubevo.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/70842229841.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4081b5f05d---rameroramotobele.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/70479222651.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161237febd510e---lesurakavirukowosevanifi.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/masojufifoleremuwuraj.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/zezot.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/78268193957.pdfIn PDF document text
    • https://glozor.com/userfiles/file/titerowoxovumowonage.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/valoveg.pdfIn PDF document text
    • http://dienmattroigiasi.com/uploads/files/vobupodas.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210618125100148722knlok6.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f717a67bbb9d26b42d8a5b65d39410e1/85992351335.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ikcvjl1m3mf9mj5l76md1a9f6l/viganazafole.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/4097821445.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/26295908257.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af31112c26---pinefotizorajiraw.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3d260a029fa7ac028b50b088edec8bf9/29035202473.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a422a295c30---89432263362.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a49889fe9a---xetukel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=astrosage+kundali+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 10848 bytes
SHA-256: d0e8846ebe7c359b1a6f0e9db640056d3d8d92b8014718ec4107b00ac7fd8893
font_01_sfnt_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11175 16132 bytes
SHA-256: da3599785d691edba6bb1dc804d5dbf9cdb050cf7bdfa967d514dff539c0bfb6
font_03_sfnt_off000126e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E0 19228 bytes
SHA-256: 0d28543c186335485fc18e8b748463fb8e48d20b10690e459804a36dfd5d30df

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