Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d818f07c5bb0bb…

MALICIOUS

PDF

86.1 KB Created: 2021-08-30 03:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f40a9366605459cfff025f69bdc21540 SHA-1: 1d54d5b9fffc3b202ece934691160a7cf14c6cae SHA-256: c6d818f07c5bb0bbf55583c815d09060958f7c3a4b7f1c2a7c63c18e21610f74
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to compromised WordPress sites, indicating a link farm or distribution point for malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/97105524a0d6e7b10ecb705443d8b524/79615812639.pdf In PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/21qoih7emh0hki5acq3onpkki3/98119502369.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713b1775344---zifagovirowum.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/547ba7fb5bfced8e9ca59f17369c43e7/28953895196.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210626130000.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/56199117588.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/97805131490.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/bt13t3smf1g6s77knp1buth1nv/dimile.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/55543245455.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/84440744889.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/rosifitigizarunuxorapuwap.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917483e1532---44735989104.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-8-23/20210823142826125297.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/29343735479.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c1358827e69---96062890699.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/6fafd5d33e05556c7e71645e22ec8bf8/wewaxosififosulo.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/wikosapezuzaf.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/66394595598.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16112bb11dc9e0---mawokadewekaxete.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e29abb3a2e---wubozeremalutinumase.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/160a5641556deb17bf66fea9b9cb90f9/62919979271.pdfIn PDF document text
    • https://sanidom.pl/img/file/73246529749.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cbdcc949a---zanugozujasodoxedak.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/mezafujijefipunejogiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=3+meters+above+the+sky+bookPDF 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_off0000e774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 19640 bytes
SHA-256: 4820a1ca1432ad67c9a0b228adbb48b637f456256578ab329fd197fb6dae12c0
font_01_sfnt_off00011ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D7 10616 bytes
SHA-256: 7a10a221e5c0483bda3f1e90e44afef66ef79582d9df7c9fecb09a8298e903ba

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