Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6f5ef85b0ce656…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 14:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 92275032731dda0c906d555ad8396b88 SHA-1: 768f253c86c627602348be2d4a9e345fa88c75e0 SHA-256: fb6f5ef85b0ce656d3b9f76b40332d4fa3c4ca7926456b417317018c5e8d1161
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a link farm hosted on compromised WordPress uploads, and 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a pattern of using disposable domains for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://idcla.net/upload/files/52580850618.pdf In PDF document text
    • http://kirakuramenandsushi.com/uploads/files/50377714814.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/rumasa.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/f9mdu6aod41slamlmbdf7olk8n/lasojubalodezuginigodudu.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/86009864521.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613896dfb09c5---foluxenitimolunixabu.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/14442806797.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/26812281203.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/fawemasavo.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210916150035.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/73508567622.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/xapexaxuso.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/remitokijuwa.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d0d17606d---57068570727.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/vorotanabozixulizalin.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/31869902146.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb2eb4570---20870946046.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/7502110965.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/derofetewavan.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/gufonepetoku.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/jipolexokavegazubalabazan.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/tilapiworufafurizuvagosuk.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/49114061623.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a223f5bb5f---zuxevadawirononani.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/kodopifolekekesolerikaba.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/pilifikapojufakitokos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=kabir+singh+full+movie+download+mp4PDF 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_off0000d6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F9 11308 bytes
SHA-256: 79b60b27d7f5335f518b2572ec17432f178d5bd08a94a74867119fc8cf315d3d
font_01_sfnt_off0000f104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10916 17352 bytes
SHA-256: b0087d33d17a8b9d4bc2fbf8027674d65ef9087d64cca77bd255d354e10a22d1

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