Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6dfa1947d9d1863…

MALICIOUS

PDF

72.2 KB Created: 2021-09-24 09:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e8b04c7343d05895d2c41b3d914bc0e2 SHA-1: ce14bede2982deb629d775b2d5e4e18a32a9b7c9 SHA-256: d6dfa1947d9d1863d5fc22357d4a2997cae330b2f760807b223734b77ad517fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, designed to trick users into downloading further malicious content. The ML classifier strongly indicates malicious intent, and the heuristic firings confirm the use of link farms and potentially compromised CMS uploads as part of the lure. No scripts were extracted, but the primary attack vector appears to be a malicious link disguised within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://studiomedicoveterinariobellucci.eu/userfiles/files/72122269563.pdf In PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/fetubudaxizazikawusile.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/96224118545.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/41598833525.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/36991997983.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d26b44180f---warosesatop.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/66537990009.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/74011816690.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/92501559810.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/4254623619.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/mawotija.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/43679979225.pdfIn PDF document text
    • http://lex.tj/img/file/58900636826.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614d0606b7693---naviz.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/39913993666.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/34376164403.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/64a35bcfa2bcfedb933ec20e333aee47/potivelarabasof.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/kulotafor.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/texazekusivanapa.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/8f1605bec4122c9b6cdae6298b460346/namubuleweb.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/javinisajegomaliberuvu.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/fisajisekadevobin.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/kemafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=panda+by+designer+mp3+downloadPDF 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_off0000b51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51E 11148 bytes
SHA-256: 9e530311963c78295966e4287c64c787be6a17fed5e1d9ba8ed18a65a332284f
font_01_sfnt_off0000cec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC7 17116 bytes
SHA-256: b34c2e9de481ec691b0fe56c9eb0ff2b3966a0df1b00d858a7f1ac1f63d69715
font_02_sfnt_off0000fb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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