Malicious PDF — malware analysis report

Static analysis result for SHA-256 42533e1e62f48f38…

MALICIOUS

PDF

92.8 KB Created: 2021-09-01 11:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd084d7e112fc5bfab6650ca3b5710b6 SHA-1: 7036a44aa69b9fb02ac169478b7aeb29e36a4cec SHA-256: 42533e1e62f48f3806a8f6d0d5c9be56ec02b5cf38a7f981b3f85010e587ff27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing a large number of links, many of which point to PDF files hosted on compromised WordPress sites. This suggests a link farm or SEO poisoning attack, potentially leading to phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0243f012c0---rujugawolikibijo.pdf In PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/tafonezugetapebilopirotu.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080f4730e0ad---27064157175.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/63541513381.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/rogejanugi.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/87356480486.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2650e2e1a---7994427750.pdfIn PDF document text
    • http://tchid.net/userfiles/file/76272820929.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870453335f9---57023217320.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/41503272343.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/xisipuku.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/sowevufuwumizop.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e779700481b---25233312359.pdfIn PDF document text
    • https://strechybenesov.cz/content/wogofinumufalo.pdfIn PDF document text
    • https://aplussoap.com/upload/ckfinder_temp/files/20210707011051.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/588df755b30d48069e460ebeeffda29a/sutiriwet.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e9076303b2b8d8c3ae769082909be760/fonusosa.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ek6j9tkg3s3acrfs7jtjkbu43c/82627217064.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/nudatemipexixolazaladiku.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/ziwenanepuravuz.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/33365549838.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/14f6489b5be9b292c3ddf0bd8122f82f/72093697595.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/tqab2lefao0tpfv65f84ro6c11/nosix.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16090165c6e378---89547933635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=devil+may+cry+5+special+edition+pcPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7E 24352 bytes
SHA-256: dd39093aeef79d5426de0079ebf1cdaec5fd91f68111ab5c676d5b83dd5e2da9
font_01_sfnt_off00010d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12551 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729
font_03_sfnt_off00012df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF9 10988 bytes
SHA-256: 662dddf7ec6822a94f99f10c3b2c3a7e60773c4d623c4873c1905fd2160856fb
font_04_sfnt_off00014792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14792 17524 bytes
SHA-256: 70e94c6d53e95b227a5383a2517f8c9124149d05ddff38859e622d8fa84eebf2