Malicious PDF — malware analysis report

Static analysis result for SHA-256 947e6a6797a71a66…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 23:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a3b5ccc4e1979620508b33db95740c0c SHA-1: f1690ad70ef65306912ac188f8e3d83c09415c71 SHA-256: 947e6a6797a71a66e3765adff6eb924f7d4a2e28c8e9c0c8b0b4ac1035a1193e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and the nature of the URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://seatraderhk.com/userfiles/49958708124.pdf In PDF document text
    • http://sayarbobinaj.com/file/72112652145.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/dajawo.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/tufimazu.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/miwotom.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a603cf85315819a18edf3e3415397348/dotugudapawa.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/55765618803.pdfIn PDF document text
    • https://savvybusiness.eu/klc/file/14310159.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/muvubibi.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/kaxumom.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/daxenupenugafu.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/rujutamamugazon.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/97769781089.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a23081305907f87a6ba909b5d328bb84/rirefekuwuzilod.pdfIn PDF document text
    • https://stotex.rs/files/74147379005.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/xufakof.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/59763711802.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/97943209253.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/18476240912.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/xoworeruvujarawuviwubefo.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/64388386310.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16140e66b2de1e---dubizenolumo.pdfIn PDF document text
    • https://empresa-venta.hr/files/68187438154.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/99266817337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gun+mayhem+2+unblocked+66PDF 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_off0000b236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB236 10952 bytes
SHA-256: 56fe849d8b34176f55450080b99f9212371eda0d906eaa21f3ce84dae46f19c0
font_01_sfnt_off0000cb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE386 15912 bytes
SHA-256: 74bcf5927dac1f455753310ed0da7245e353a0036193737bc4f5f5463fdde5fc