Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c28c7ed0a3ec139…

MALICIOUS

PDF

79.7 KB Created: 2021-09-10 05:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 463c6ac10bff6637afe6e62a87037fbc SHA-1: f10c5c4489e8b1b11ae781e3ebd4e29d4df44c86 SHA-256: 9c28c7ed0a3ec139763f750fb558e754af690a8e3d73763254203acdd124397e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a phishing lure by hosting a link farm on compromised websites, directing users to download further malicious PDFs. The presence of external URIs and link farm patterns suggests an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wastran.ru/uplcv?utm_term=recupero+dati+cellulare+android+schermo+rotto PDF link annotation
    • http://cattaneoarchitetti.it/userfiles/files/93338639073.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/nabaneragakabesexuxifite.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/69777438573.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/65516100224.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/12944174861.pdfIn PDF document text
    • http://vlajamo.cz/images/file/xidabizavizo.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/20792296369.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/12806452263.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/talepokevofur.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/8a521fes81b62ufednm2qhvcb2/jupifuvutoma.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/mitekuronowavenonegusemo.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/sulawanisate.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/57527656806.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613053be07d57.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/zaxufemukujalenerabofu.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/21723016560.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/vezuxebowage.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161300ebfe05b8---58141446047.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/2e0157e9d90b17cfa9a33aaf58768869/sujidofuduxulegilekuku.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/rozikusewulugumurizise.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/ratikifoja.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/86922611145.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/3354365065.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/ganavinimisagodupenopi.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_off0000d179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD179 17224 bytes
SHA-256: 8e8308db9710b67bc1f7c03ccab1da2ef551867eb47a08edbae8bcfd03aba85d
font_01_sfnt_off0000fe49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11660 10924 bytes
SHA-256: bc4bd94ae2f75cd2bade78b6bf8acbf47e53f79486f7f2c700c2baea20f7d0bb

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