Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40f95fef7379003…

MALICIOUS

PDF

85.2 KB Created: 2021-09-04 19:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 33f6f37c5f882966507abce29d0e0fdf SHA-1: c4e16750b541e7c7e6c60a4fd094665176d05fe0 SHA-256: a40f95fef7379003442e85604b8bf7003fd749bac61412fc7bf3634869732389
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV heuristic strongly indicate maliciousness. The PDF contains a link farm hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. While no scripts were directly extracted, the nature of the links and the PDF structure point towards exploitation or redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906027e1593---leduweka.pdf In PDF document text
    • http://bualuang101.com/backoffice/upload/files/wodenojajanedidu.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2c4a2b3e---kikebuj.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/95463823965.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/wudosa.pdfIn PDF document text
    • http://www.olivier-frey.ch/user/web/file/jepotivudanejuru.pdfIn PDF document text
    • https://tl-systems.hu/files/files/9540817871.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/24177043148.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/76865724858.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/zonararerazowa.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/kelevozemajatigosizikizu.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/jesorefuxujukof.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/97783403949.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/d07145bb06b0cfd8538d5d8c58ea0814/gofikemabinegiv.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/mezivasoluwufazomuse.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/47957332666.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/xugapavilitiwek.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/dusolutoxuxevapeja.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/zafabizavazomadodur.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607220d50531c---47679211865.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/9494712070.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/pajonitu.pdfIn PDF document text
    • http://starma.pl/files/file/fewunemasi.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/tanimepofanutama.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210628_054518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=2020+toyota+supra+manual+conversionPDF 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_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 17320 bytes
SHA-256: 9fad84cc118fd32eee3cc1edd75da89f975a2d1145d1bfbc1c44e75b6d4be887
font_01_sfnt_off0001156d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156D 10960 bytes
SHA-256: 6c45edf1b77b0e5ef265d6539f9ae8018b42a76e789743d3e0acf201a20c0a13
font_02_sfnt_off00012ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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