Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe458893086f065f…

MALICIOUS

PDF

104.3 KB Created: 2021-07-07 00:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 08032a827dff371593724e69946e9d8f SHA-1: d3f5977f135b14e68d91d10db6f0618433237562 SHA-256: fe458893086f065fa8c0cc67439370e782535137d6e8f5e7538fdb393433cbab
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised CMS upload directories, suggesting an attempt to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs and link farms are common tactics for phishing or malware delivery. No scripts were extracted, but the structure suggests a lure to download other malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9847

Heuristics 5

  • 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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f96135948---kujapen.pdf In PDF document text
    • https://lecapsuledigian.it/file/nosanuzurexegopi.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3a18710b9d920928491dcfd24e437233/90445831217.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/96376612224.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/beb398608d4a086e9ec2baa4589d511d/lodevak.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2b856b908---vunugije.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784410089f6---94345183539.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/ri15gfer1l63a9vf00u7j7j0a4/99782269533.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210619055555_d0aye5.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3817d68b8---vuzerukas.pdfIn PDF document text
    • http://vswet.ru/f/72790109843.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/xilifegazi.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/jamixi.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa41c960c---6392213884.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/d0f06c7cb90893e58b005a75051259fb/dipebemarirunasazaw.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970da08bba6---48622663817.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b07cc3b0f---61274018637.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/d7933ba28135b43ea512933c5d1fece5/setusu.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/8387248048.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a411c2979c8---17773466045.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/fumadebisugepigepenesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=never+underestimate+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000e87d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE87D 20092 bytes
SHA-256: ff96a00b6b6b2a431a793f2ca46bf8b95c7d401cdbdb16229a6cf28146ef31fd
font_01_sfnt_off00010bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDF 10568 bytes
SHA-256: 7d599279980e3d3a82f13bd251839b878f2924976797ff4e730abe031d5c46ef
font_02_sfnt_off000123ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BA 5392 bytes
SHA-256: c4b771988720c0e210081963323dd1c5dbacb272c72b6cb91ef8f17bfafc47a7
font_03_sfnt_off0001368a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00014e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E9C 28112 bytes
SHA-256: 4342fbacdf6d26af52dc5e8077b579b83dc72d7ed59c27637aa82fe4fcd5205e