Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a3efc30f8f31a7…

MALICIOUS

PDF

97.7 KB Created: 2021-07-25 11:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 02d0ba7552f881d6119bbe8d9ffa8995 SHA-1: 189e5358445dc69cd5a3803245a9647bc7942dd6 SHA-256: 71a3efc30f8f31a772dd8fe78ab3b2b44b9ac5c12b1b8035fad8b421f0f1f5b5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable domains, indicative of a link farm designed to redirect users to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose beyond what is inferred from the heuristics and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://master.plus/wp-content/plugins/super-forms/uploads/php/files/67341ba8ae37501111e03d542a3c87ed/gonadupalisuvakakelapub.pdf In PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/7306695908.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/62955658997.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210616224242_vv2grr.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8c7e1ab15---xikux.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/xigosalola.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16094db0fe8b62---97075710877.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/kivuwufu.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2aa00f634---jalutemiguvikenagaxow.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/rujifi.pdfIn PDF document text
    • https://soechi.id/userfiles/file/74593929073.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/derejatuxebetadomojejas.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e91f56116a2---7524607284.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/fde5f771e514659394ac9f76f201436b/fiwunoxo.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aacf114090c---129202277.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/fewisodefoludapuwodexuwev.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/48498607137.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb57e3c7a1---46672220821.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/73e61c5793d48094f20436be5e7c18ff/dovekojiganutaw.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae37a1c1d85---luvev.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/sagifom.pdfIn PDF document text
    • http://blueyee.com/upload/file/060055493449.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/26586572810.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/92fecf9b5fc6bb5a995169d5df4b2060/jumijibejoloz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=american+bulldog+johnson+type+for+sale+in+georgiaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 11532 bytes
SHA-256: 1cb7d42361329d85286a38cbc8bdbf6cee7725469cdbb1a2f1fa34bb740e56e1
font_01_sfnt_off00011c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C31 17652 bytes
SHA-256: 286b59466849d662cc166aac7b7e9e326664e52ae2089e6b67578708aec19cec
font_02_sfnt_off00014a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A51 16348 bytes
SHA-256: fdc3f250e16d4eeaac0151c08e1678493ac6cc67090af3137bc700c4cd553891
font_03_sfnt_off000160a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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