Malicious PDF — malware analysis report

Static analysis result for SHA-256 924c78c8232c3788…

MALICIOUS

PDF

75.6 KB Created: 2021-09-05 15:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a6100ff55cba061d3edbc3f433919014 SHA-1: 8c753d765b6de4b79046b81d83dbec5f3fbc3c39 SHA-256: 924c78c8232c3788f019e3dec4a0e3fecefdd6f6c9d1f7fa8485667fd2a27b03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ilkemymm.com/image/files/41056871346.pdf In PDF document text
    • https://queensflower.nl/clientfiles/64935888759.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc53eea3a87---bumopijaxuxuzopen.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/627hp833puc11hig6iht068jk0/xopixevekeferusunuloru.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a359e2064cc17411551b31a2c46d6162/17063259572.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/pelezazitazixuluxebebutif.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0e549422d---30445522928.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8ae9d5daf---bazamixuv.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/05d4edb29b5dcfc43ece7d9bb3bf850c/20168341107.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/17839477628.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612672e1d59f0---32105280738.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/56082337504.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/jaxizigob.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/40572258959.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/6891694442.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/43689413177.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/lulasoxalidevazel.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/vifutufitomidoradawat.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160907f82703de---46178338460.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725ca7187cb---numevo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca673eab8d---mirix.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/a5236tt79k1onl8bc9ppncavd3/xawegubexekosego.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/39e4ca611b8cdfaf536b056da818857f/66122746010.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/xobonuzojepivis.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/67534655214.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/22742627057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=timesaver+mind+twisters+puzzles+%26+games+pdfPDF 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_off0000c3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A3 10708 bytes
SHA-256: 0008a13f6c5d6a8a38389c95748159ee05bf6ddec32be2b9eb3ae26e11c720f1
font_01_sfnt_off0000dc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 17076 bytes
SHA-256: fa347fdc62639dcae5496ec92ac3acff0522c5f91eb5dffa55275232a7f50319
font_02_sfnt_off00010860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1