Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef511cff7444d07…

MALICIOUS

PDF

90.5 KB Created: 2021-07-19 02:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 783490a47a1c7c6f58cf7bb24b4374ec SHA-1: 4a34be43ac1af848650649113abfb5d3ec0c49c0 SHA-256: aef511cff7444d07585354cf5a246ad19247375a2f3e6929f066d426b31a8f3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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://bd-sokolovska.eu/userfiles/file/23627831212.pdf In PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/pibpkjtrp0a04evl28jlie4hl5/14934939457.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/babojisa.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b050ac33e6b---11571693760.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607491c724daa---68283595913.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/57099704269.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/82001411302.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/jebujebejurowaja.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/11239388971.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/8401019277.pdfIn PDF document text
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/weson.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/35768553075.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/70gggjgk41bc2189kb498tukf5/39253435121.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/95291533020.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/kowiromena.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/zawajifaxadiziteg.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/sqdndaaen5hpan5qcldsc3trkb/neduw.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9558963dc0---87824202325.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607087475a50a---35606191411.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/79688483446.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608629b3318d8---rokofisuzojovizoxefatu.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/gn8hmung9dm7bb05f122uaf2ge/gufexagijelijafa.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1323cc532---rugilokute.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/34296913287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=3d+layers+of+the+earthPDF 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_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11425 18400 bytes
SHA-256: 3e307d51467d37414bf860ccc9caa20eae1c0a5fa1ea3fa8be54ca78d5b8a6cc
font_02_sfnt_off0001453b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1453B 10444 bytes
SHA-256: 4264fa94676799aade5172e4db2c1e6f873510f5450944f475e958a0d34aa397

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