Malicious PDF — malware analysis report

Static analysis result for SHA-256 e426951ad3669fea…

MALICIOUS

PDF

72.2 KB Created: 2021-09-24 16:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 731d1339a01e63094955e68001757da7 SHA-1: 29b05a1fe264bef613a2d86d0b0bc650a0f859ad SHA-256: e426951ad3669fea24c0ef49fecb972522fefcbc6c53d80896b70fd0435f2a87
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, several of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://universalgroupautos.com/files/others/sarubasutazot.pdf In PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/xafixutivusosavijoxow.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/54078571973.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e689a6476b---8844755329.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/dibugod.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/safavurijazovubujo.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/pujanajisadajujufepexo.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/3940916445.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/55581277686.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/madiwokuduvuwegoxamirir.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/87429493340.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/kugiza.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/zabokitusukuzo.pdfIn PDF document text
    • http://blueyee.com/upload/file/171915535037.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/xegodipoz.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/90831620475.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/xasufafurisaxorup.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/98729440124.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/bexutaxamugejimur.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/36214418662.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/1745653650.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146915c30614---fakixabekewilo.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/lizev.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c666a9eff7---wememalatisoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+change+ringtone+in+settingsPDF 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_off0000b51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51F 17900 bytes
SHA-256: 48fb8c45194b03c185d331a5c6ecdad4ac7456ee0f71be12b0e1eda12c72aef6
font_01_sfnt_off0000e31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 10540 bytes
SHA-256: 62a1ff13590eda5de24d7a65914cafb3372600521ec7a5f98085382965967501

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