Malicious PDF — malware analysis report

Static analysis result for SHA-256 739d63e8790f562c…

MALICIOUS

PDF

71.5 KB Created: 2021-09-03 08:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f807d2d162439d62bfa90f7a360f2cf9 SHA-1: f3ddf44c8272fdcb1a8020b188b8d38b7a577dd6 SHA-256: 739d63e8790f562c692996c870148f65aef592729e18570e782fe3874723fd3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users. The file's structure and embedded URLs indicate it's likely part of a phishing campaign or a distribution point for further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://philabc.ru/uplcv?utm_term=seguridad+e+higiene+en+el+trabajo+definicion+pdf PDF link annotation
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c52ba4e0ddc---62406179272.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/i5nvuf1os3up73dfsqg2lifvkd/nuvogevomote.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/6v9u6lu53iumbh3n38gh8sul8o/fifemagidanapexop.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/dowumotosenobiwuzelid.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/17338220135.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e1e5d53b95a32142c4aeb00cd81ceaaa/juxawuworitotepowudikawa.pdfIn PDF document text
    • http://nature-revive.org/files/file/1951333863.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0v60nnjaiu64jtqs1lu3kcv89u/70357766633.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/zupozavamirinedek.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/0a3fd3f3b1b638ca4d4768f5fe349ee3/sezifekipatezadefopabux.pdfIn PDF document text
    • https://birotex.rs/images/files/xaforuxadovup.pdfIn PDF document text
    • http://blueyee.com/upload/file/080653487583.pdfIn PDF document text
    • http://benetalent.com/upload/files/dokuwurelisizosejaju.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/aa62a76d2f2d75cf0fc755989a9da46b/24599437231.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/97092126919.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/1def45ef4c2417661755ea19a8d9e824/xapavegunobutipowezabawaf.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607304c3a582f---41506795165.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/010704399400.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075d32dbf41b---ritofakul.pdfIn PDF document text
    • https://yuss.it/file/42414688605.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210820190447.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78809aa309---73944986923.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/66016119282.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f45221546---mogufowoxire.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/74976927313.pdfIn PDF document text
    • http://hosvagyok.hu/userfiles/file/pejagapugasak.pdfIn PDF document text
    • http://8njl.com/userfiles/files/63250549627.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_off0000b65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6F 15500 bytes
SHA-256: 7014f0642a37d4f6bc5d6f4341c9848c9a03497eaf651f49d30e8658e2832977
font_02_sfnt_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 11176 bytes
SHA-256: ca99dc67072c9560dd9abce803a51dd1f14d5af7d1fc2349814934f162a0972c

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