Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b51f8685d1d09a…

MALICIOUS

PDF

91.9 KB Created: 2021-08-30 06:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 76fc93de425d32f229f407951faed2e5 SHA-1: e9f8f7bfe4a8aea6417927b43c902d5ef293a72f SHA-256: 70b51f8685d1d09aefff8697c34531bac2ba40eee9f9d4d278f5c9e1726af56f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload storage and other potentially disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body is unreadable, but the presence of multiple external URIs and link farm indicators strongly suggests a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://bistakalikotenetwork.com/userfiles/file/48741180425.pdf In PDF document text
    • http://totoquynhhuong.com/upload/files/94711363013.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/wosezarenegizofififonu.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/virowu.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/78538105185.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/68604440149.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/22107930930.pdfIn PDF document text
    • http://teaandtiarasmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/46446138776.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/44003318509.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722c49d67c3---7024275056.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/jivarevilonijesalapakun.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd3d266684---kabexakemadejutavub.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/giginobebop.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0f816a2a3---datikarizadanuza.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e287469259---gatuwemuzifajirabu.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/b067a28f0996847fcf768fe3c46e1e28/57064765390.pdfIn PDF document text
    • http://wohingltd.com/userfiles/buribozezit.pdfIn PDF document text
    • https://digireg.pl/upload/62301385632.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/bekozeka.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ag9df6erhl5di68mn0l04lojei/toguzelatusazokalufelowa.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/r642s2v6etr9vpn0rocgm5bhdv/ludawuxosokakovagitiva.pdfIn PDF document text
    • http://sammyurias.com/userfiles/files/kenisodonalesu.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d0a1b848b7daa92857935e909ca1418b/rixefavowuruzu.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/saxuxowijuluwivuvo.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/ratorepunoxepinosamug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=minute+of+angle+chartPDF 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_off0000fe0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0F 10540 bytes
SHA-256: 034f101fc099509b7de3f42649047c6c60e9231a821ad6d82dd0e1a72b1dc1c3
font_01_sfnt_off0001160a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1C 19612 bytes
SHA-256: 8a71d0a41c724715a3bc3991cefc86651f4f672ce4d8dc0603315ca42d2c54c7