Malicious PDF — malware analysis report

Static analysis result for SHA-256 d087140373b8c69b…

MALICIOUS

PDF

77.3 KB Created: 2021-09-26 19:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ab4b67f65c9c346b47aab9e3b07fd21 SHA-1: dc612785ee58d98b71284623611ce58e4f59a828 SHA-256: d087140373b8c69ba29a75a79c6d423b12fef75b3b09f5a26a65f05ef289a165
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 link farm pointing to multiple domains, including one identified as a compromised WordPress upload, and another on disposable hosting. These elements suggest an attempt to redirect users to malicious or phishing content, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://jkbprivateiti.com/userfiles/file/92398244819.pdf In PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/54598527960.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76087828235.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/5d52749e3881d52d2f525c2b3d687fcd/sorufitopimotuximetu.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/goronemesazojexogumelu.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/66461761781.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/94619866060.pdfIn PDF document text
    • http://saint-party.com/media/file/musoxapa.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/15386738470.pdfIn PDF document text
    • https://edex.co/userfiles/files/vadosekelidasuraxutoruji.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210905_191217.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210920061942.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149826dba2ea---livave.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/kuzabilezuriwo.pdfIn PDF document text
    • http://vbond.hk/editor_upload/file/buberuluvaxapafuximewet.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/21092200434144030984c68.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/f094fec39042a10f7b1c0955d90c0f20/zulevitepujure.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/967e402d1afe80c2b4276ecda47df95c/3846356039.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/97213131381.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210925154541.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/65438487178.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/86053537385.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/21157886063.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/figugijizogi.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/venuvazobilamubazuzuvupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=best+way+to+send+large+video+files+from+iphone+to+androidPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/1901343952.pdfIn PDF document text
    • 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_off0000bfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D6 20048 bytes
SHA-256: a1cf564aec5daf8ff25eefd1465e720efc8de89351847a5cf0aa76e21b31ec0a
font_02_sfnt_off00010cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB7 11264 bytes
SHA-256: 9156f219e91987c29beff05a085721790d52439b4f282350fd439437ee8c4b7f

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