Malicious PDF — malware analysis report

Static analysis result for SHA-256 03daea0da7965283…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 16:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fd885ec3e26c355d5d90cb3e5d90900 SHA-1: acc1d7a0752db11756c17fc1dd74631e57708b38 SHA-256: 03daea0da79652831f60a204661cff20f823b3f2425914845130d615836c149a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating an attempt to obscure the true destination of the links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 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.
  • 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://africalegal.nl/userfiles/file/42006962367.pdf In PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e7a9ceabbea---gigositoti.pdfIn PDF document text
    • http://huiking.cn/uploads/file/070845163002.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/rnri28qt510ao1h6igsk76a9o6/bitulexogiraxoneb.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b76dea828a6---lafepisuvag.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/30604798296.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/5426bac917d5529c226ecdf1e5db75b0/nawalug.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/91324888106.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/labonot.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba14b00bb28---43911556413.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/6m65si2s30srecc4jsetmdtn61/wadunapapesutefawuzesube.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/rowatuxiwuxizepozexus.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/m246pl7oj9gugd77vud3th9o36/topemunepatan.pdfIn PDF document text
    • http://gojjang.com/uploads/files/wetugasobujagolesamukot.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/v4n6317tunticuahh2qp5d31sb/56553415046.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210831_044439EC48D5467F.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/49773246304.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160945273271d5---14230496994.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/lusidu.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/5af89699c09735472a9836fe93806f0c/51081662662.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160cf650f47ed3---masajagipin.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094983ace9fa---68979110474.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/jgss1qdop51o3dkkf5909lhir4/mowaxip.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/53042313577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=past+perfect+progressive+exercises+worksheetPDF 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_off0000d001.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD001 16792 bytes
font_01_sfnt_off0000e813.bin
af927243565e14101afd183bf9d6f950f89bba5d690158856ca31839719fd7af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 18112 bytes
font_02_sfnt_off0001173d.bin
35e53ba066ebda1c5b1aeb415d587e7d8f5713d87162d40cc597eca9806f12e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1173D 10956 bytes

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