Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90adf57c250b733…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 00:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3e6e1fa1f2607c2891c23054edaa3c8b SHA-1: ecd7b36018dec8d717b8c77b71f45467a0eea765 SHA-256: d90adf57c250b7337059079052fab383cba914bb25a162e4df9a6c39fc22320e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and a large number of external links, many of which point to compromised or disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer, likely to facilitate further compromise or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://highrise.pl/file/44353805709.pdf In PDF document text
    • http://zatoodesign.com/userfiles/files/21425218572.pdfIn PDF document text
    • https://patc.fr/imagesfile/wibogunelegidowusologolix.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/gojinojopetutaremilevovol.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/84796166783.pdfIn PDF document text
    • https://mangallagn.com/images/file/pijurutotef.pdfIn PDF document text
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/67392840941.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/885859149.pdfIn PDF document text
    • http://centromp.it/userfiles/files/43482710472.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/34245600545.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef0384401c---73237664116.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/fizoxori.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/67554595117.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/39516228009.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613170c21996f---63310884857.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/52231385330.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613581a14e395---xexusoraxari.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/34958233500.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/1605463264.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/rudiluxowofawonizan.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfa37af15a---kikaderowewage.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/23099316327.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/wofujuxofutugokipagu.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210905_B2C1033C47945474.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/2269277427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=royal+battle+survival+mod+apkPDF 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_off0000b46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46A 15112 bytes
SHA-256: db7d01bae2b6d3fd272cb3536e25c3c04824511b08050b82ed8483038f98ecb8
font_01_sfnt_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 11004 bytes
SHA-256: 46d6b14cd0bc677772ba0b45c587f76645253a7fdf01616b088d67f2a82728a9
font_02_sfnt_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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