Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88df132ca6ed8c4…

MALICIOUS

PDF

71.2 KB Created: 2021-09-01 15:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3395df47234d9a4ef4fa2c4c22f35b9b SHA-1: bcee26ef9db248c55e9cfcc8d9d6a89bfeb0d8f4 SHA-256: a88df132ca6ed8c4285804ab754edc9da111069cc713ac23608f153db51b473e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, including those hosted on compromised CMS platforms. The presence of 'utm_term' parameters suggests an attempt at SEO manipulation or directing traffic for phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://yenhuy.vn/upload/files/43538447468.pdf In PDF document text
    • http://assistance.uz/images/shared/file/rabapilal.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/wuzulunivukal.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/fejujosuz.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/nekiwopaguv.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/lixuxilazogekojogovazik.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/netobef.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/16248519298.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/4085896862.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/8361509879.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/5266ccbc64c4e6cc8f3d47e4c0ee5ef6/nevenu.pdfIn PDF document text
    • http://biosite.ru/images/news/file/73005936111.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/pugojuxemigazikazazewinun.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/9375294902.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160741eb33d050---73338528169.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a734c6151---70335764448.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/xibinawawob.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7794c75877---80207830617.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be5650b2608---3567476817.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/91918379235.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nixerinuxufukuvodog.pdfIn PDF document text
    • https://nistd.in/userfiles/file/pimowubedamulepowubizen.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/4a0d76cad74744d60f6b477b42b143b0/42606559533.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/fususizokulila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=kutools+for+excel+pricePDF 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_off0000b6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EF 16224 bytes
SHA-256: 39cce2e6d0046e3d7efe8a993386ce2d516d08ae10bfc3b6817bfe3b62778408
font_01_sfnt_off0000e01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01F 10400 bytes
SHA-256: 01768df511ec08a6a5f4d61260adc500af4e8b5d9ce08b33230ac5391493bed9
font_02_sfnt_off0000f7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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