Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf9031a562a1e52…

MALICIOUS

PDF

55.7 KB Created: 2021-07-25 01:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3be9a704dc5c4e2a69cf65251c9d6d55 SHA-1: 48064cb96608b0cdbeb04ec738e51b6b921d1cfa SHA-256: 0bf9031a562a1e5227d64d575d99aa21e27b513a75bd78b25ce03329ca63e137
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is being distributed through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8560

Heuristics 5

  • 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
  • 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://conexusinternational.com/ckfinder/userfiles/file/jebirirufosagomefibeta.pdf In PDF document text
    • http://maroba-zirndorf.de/file/67896383956.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/35159468267.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/48647883020.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2d66ef6e3---vomuvugofatefonodeb.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b2c19333ca5ab7cb234bcb1b5a6ad7b3/77920797981.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef3d155f7f---52599892648.pdfIn PDF document text
    • http://wwstationery.com/files/file/25680059166.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/jd0vvkgal2mspc2237dmeu5dqm/lesezavoxosepivotipi.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/cd4812885ff2edb1d3718f4e275ca19f/veletivez.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/50ee737acde215329d667c611e1e3d4c/nasebivarajuripemomiv.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c18601f09d2---dagesetimitiko.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/5d6fbc23f75d4bd4a8418d6dd094b406/21693168658.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/08u2ghfja8jk3n5jdgd5o0t1nl/28929860003.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/91393435675.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/numegudujig.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/rifukiw.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5cb593b5f---18865151488.pdfIn PDF document text
    • http://thompsonhigh1980.com/clients/4/48/48b9e10b24f1ac3c627dfd5bb8c45987/File/kosizumepixilobudegu.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/22556552414.pdfIn PDF document text
    • https://edarky.net/data/file/52570994620.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b29e5b1d4e1---dodexididesutokiro.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c2ef27895---muxutavabijufajigopimefeg.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40ea260c9d---12002568883.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094d501eb214---gajitulonitebawofasovupas.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d6d900af0f9b626f4579a25c53141876/95888199431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=harris+d.+an%C3%A1lisis+qu%C3%ADmico+cuantitativoPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1