Malicious PDF — malware analysis report

Static analysis result for SHA-256 051ed46b8e8b1d06…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 18:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 912df1507c26ca2b102aac9cb6907446 SHA-1: 3ef45da135f4896528265d5b1ea6d5ceb3509cef SHA-256: 051ed46b8e8b1d06f1d1da9038c9b1005004c5497b4b7ea32dd62633bf076d88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are identified as compromised CMS uploads or disposable hosting. These links likely serve as a distribution mechanism for further malicious content, such as phishing pages or malware. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=android+mtp+driver+for+windows+7+32+bit PDF link annotation
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a922f41788---pipunutofanixil.pdfIn PDF document text
    • http://nprofit.hk/userfiles/85374422141.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaa8847871---zulazopefibajugomitenebe.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/47239514884.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305ed80f2bf---niribuxukorexenobuxesi.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/wusokevepemedadef.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/figuduwizavu.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/gesizelaj.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/63609200582.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/9j04p1f8vn1vmseqqt2kfvr8v5/58006877678.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/32465653385.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/4840709506b090dce5189fa0e44498d8/wezonezebepamusilamivab.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/xinixipez.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/rodumolinosotudifujidi.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/96276087345.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/zijirojozezoveniki.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/zewesetifar.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/27427002667.pdfIn PDF document text
    • http://beta-rc.com/upload/files/3769326585.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/korelupododinuv.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/zesipulozasuwiwutilu.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/98749915637.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7ae1ce6c8---mavexozemono.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/42395941376.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_off0000da61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA61 17704 bytes
SHA-256: 7b111223a551184294d1c63103d77bda0d6107ca204fa3b2b5c0d01883085751
font_01_sfnt_off00010853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10853 11068 bytes
SHA-256: 1d326440d05d0742d50ddd9bc691f16292789131b12e35e791b535377d69f02d
font_02_sfnt_off00012216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1