Malicious PDF — malware analysis report

Static analysis result for SHA-256 287ddd407d7be097…

MALICIOUS

PDF

90.2 KB Created: 2021-07-21 13:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a4498f1c1e1e32127716179eb67b266c SHA-1: cc9d9ee7e94a04adc50ca1388948a0697aac9e78 SHA-256: 287ddd407d7be09761f53bb4e89b425ab7ca11486542ae00a24211ac8c8e5991
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites. The PDF document body is heavily obfuscated, but the presence of embedded URLs and the heuristic findings suggest an attempt to redirect users to external, potentially malicious, content. No scripts were extracted, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.1247

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa9d4f798---30357101623.pdf In PDF document text
    • http://self119.net/upload/userfiles/2021/06/files/210621225925.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3345245fa90cae3aea7a6b34ba423edd/51188331808.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/27642563745.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b3d23d71b---fokuked.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-7/20210507210226421220.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/1254437045.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/balapuzafilezolinoseno.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c866d93d80---vegeb.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/15627cb1695d699daac5e054bd22a86e/zebupikosukexubaribaref.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/02654ea52a80ba12ab8e55c5133b583c/39188657559.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/fenijef.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/58bb8f8255c328939a85faa8f6dc0174/78322205821.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4aea94e4fb---52687926464.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160caa6f56b723---7066125649.pdfIn PDF document text
    • http://farashimirooz.com/files/41885159217.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021061111564770554.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/16720445846.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/vurunenodatazidil.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/54264835168.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609210250a278---guwusafisos.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16076928bbce9e---retuvuzowuwofimowe.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6139c70fe---jafurewepogir.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/3469734182.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160834b0ccca51---fesodusibinuliwisewoxojis.pdfIn PDF document text
    • https://bloomeng.com/uploads/9029186707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=apps+like+lucky+patcher+for+iphonePDF link annotation
    • 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_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8F 17256 bytes
SHA-256: 2e163b01fce00cade62cc45d55f127ffa7f0dd5b6421157a27931ae16e9246d0
font_02_sfnt_off00014b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7B 10864 bytes
SHA-256: 0cda814c0a79dd156ff78a99caa0418358efb3caa2cd809edb11babe0ac2f044

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