Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb67e38cdef3f45…

MALICIOUS

PDF

77.0 KB Created: 2021-09-16 11:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2e82c1de3ab05a8f79c912c39ae27be5 SHA-1: 093326091d8594dca694d1c45998d15940a08940 SHA-256: 3eb67e38cdef3f4501f36a81a7d66739fd366b3cd3e631b023001eae5007b263
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads or executing exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://garglob.ru/uplcv?utm_term=lords+mobile+kingdom+war+apk PDF link annotation
    • https://wronba.pl/uploads/wysiwyg/file/70944818661.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/kakenuludi.pdfIn PDF document text
    • https://jurad.eu/files/file/14176038247.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/zefejelaki.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/85721597557.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/47738943718.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/kukexijel.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/bezigonuniseluzab.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6223e4b04---kiwalojirerizipul.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/68923273423.pdfIn PDF document text
    • https://netlandschool.cl/files/faxizupitobutejorogimuvi.pdfIn PDF document text
    • http://samtekelektrik.com/files/sadimebidopelafipagaz.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/38395890502.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/fowopofunu.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/26926961443.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c904317c25bba35e5a1f98261d1cb2f1/27652788933.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/wivemi.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a3720ab6f0c9c6aed22ab3136444073d/vofuxomaxap.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/kixuboxukawexaravuguwe.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/49306057693.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/84501881549.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/sugomeputa.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/8185083141.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/9187570277.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_off0000c536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC536 10912 bytes
SHA-256: 6b6655b464d043730d00915e631f72888c81e375093fae98fd383595a614fa1d
font_01_sfnt_off0000de06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF618 18500 bytes
SHA-256: 3ea7ff2b2b68e0edfd0990ad6b45b8cdcc6d7d0cd7a557f48385593ed75e5237

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