Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5922ce9a98faae4…

MALICIOUS

PDF

85.5 KB Created: 2021-09-13 11:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 65d6f137977592cd0e47a3cc5c72a960 SHA-1: eaa758d0ae21c6ef5abec4ba032dc1717336a18e SHA-256: e5922ce9a98faae41bccffc625566a18203e6d3fcd95943ab9fbafb79fa372cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which appear to be disposable or compromised hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs to host a large number of links, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the structure strongly implies a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://coretry.ru/uplcv?utm_term=benefits+of+taking+a+shot+of+apple+cider+vinegar+before+bed PDF link annotation
    • http://llux.vn/uploads/files/jatikam.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/somikepavipowow.pdfIn PDF document text
    • http://svx.su/ffile/file/muzoli.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/46859690009.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/wijakemobugiburotafa.pdfIn PDF document text
    • http://farashimirooz.com/files/luxezebujeb.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/dotebudij.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/isqaq22n3mjc721l3ndovh56cn/wibebevosupamerirozat.pdfIn PDF document text
    • http://msiutilities.biz/documents/14383756361.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/62370685217.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/13676074279.pdfIn PDF document text
    • https://ferropula.hr/files/63907491828.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347a7c99b12---xisos.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/luvanukokev.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/78757674436.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/gexakaxupuweponokofefap.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/zewemebosofelidakaxubati.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/802437a7d908b750073d06d41e94f702/gubudafowesizevi.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/89198096025.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347cb65ef49---95542341037.pdfIn PDF document text
    • http://myslizdrave.com/soubory/87667401495.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/17173252068.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/20534539184.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ac6a56acb---62867160268.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_off0000e86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86F 17676 bytes
SHA-256: 5fbd515cb5ae6711fa307b4d1284ae8dd1e841adc542b3282ae1728e69f363ef
font_01_sfnt_off000115e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E6 11248 bytes
SHA-256: c7f455329e2ef911d898a97a4acfb4f6d3ab2a8027518925da356bfdae1d439d
font_02_sfnt_off00012fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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