Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b23590c3b511ab…

MALICIOUS

PDF

76.1 KB Created: 2021-09-20 21:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 812cb2febe784d9498c9d1b79ce6b97c SHA-1: 6d226c8b0102458f5fd18b107b5b5ad98c7c7617 SHA-256: d4b23590c3b511ab9dd2165241abb7328cac5938567ccc4f5868e08bbf3dbb4d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farms points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=gta+san+andreas+mod+naruto+apk PDF link annotation
    • http://rayocazar.com/images/elfinder-1.1/files/file/88224834022.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/xevurunuzupasozenuxi.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/kepevaxolelomime.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/ruxivubatodafo.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144f3e95ace9---semudatiresenofexoxuxo.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/70229412071.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/17641404891.pdfIn PDF document text
    • https://maria-galland.ru/files/file/59291147184.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/sapajoxoxemezuwope.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/75875182109.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/9646828457.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/jawakisigelivuvufitu.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/ponofirofapo.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/72651175948.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/96856274256.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/ferovojotoretefoma.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/781876726.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d3464d177---zuteku.pdfIn PDF document text
    • http://videlec.be/ressource/file/93637555258.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c753ca42---28353102759.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161443c9da3e32---2117105896.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/85693144138.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/bapivekipewu.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/jenujus.pdfIn PDF document text
    • 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_off0000c492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC492 10644 bytes
SHA-256: de1a431120c82caee880452991ffce9ec241319542b96a33c9160f79d76c41f2
font_01_sfnt_off0000dcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 17600 bytes
SHA-256: 6663387d5d95904c27b24b014b5a098b6c336e84bcf64fb9a4c86229d03ed210
font_02_sfnt_off00010aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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