Malicious PDF — malware analysis report

Static analysis result for SHA-256 8feb46e6151ac0f2…

MALICIOUS

PDF

88.7 KB Created: 2021-08-02 07:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 97a822255fe008f92d079397d868dd05 SHA-1: 4caf1728e2f4925653b1094ca52d76a1d85fd775 SHA-256: 8feb46e6151ac0f298ce784679e9a4275cd975f7d9cf097e7a165b8dab34f8b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://coretry.ru/uplcv?utm_term=los+grupos+o+familias+de+la+tabla+periodica+pueden+ser PDF link annotation
    • https://fultoys.com/userfiles/xixonivan.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/luzuwizobulo.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/mefabigagonuxo.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9dde4383e---86214590589.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7572b6f1f---pirifukekevubaxasar.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/73ad4ebd8aba11032f528a12b172215b/84268992717.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd9db68a54---58592514451.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/kujikowelutu.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/mitunixumed.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/28768322939.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16080839a3b6aa---vukiridibaloniwejufe.pdfIn PDF document text
    • http://rts-3.ru/upload/files/worasazedifibakewedo.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607635195b9a7---fonivudobezadufujiso.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a613c1d397c0850bc68aab926f0f91eb/vodabozepisamazew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3eea12ff7---gujifawa.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/52883475809.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/nepoxekobewisijozo.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/25366822423.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/37384908923.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cefcdc5451f---85648410093.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/88448984056.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160756ee94c48a---ziliri.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/jenidanabirokarezutivogug.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c980c7f2f---37359221571.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b1be5c628---wusedivezivolenefapegoda.pdfIn PDF document text
    • http://rld-carbon.ru/file/30420543456.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0b040466ccc28762d6b4dedc75594b9a/57840259017.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/58198cc0e7918d5362e32b92edb0d79e/kevojuluwununaxurezaso.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_off0000f064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 18672 bytes
SHA-256: 2297158cbc74bb071cf7ba3e1505d438716af7bd37e0bad719fb3a277e132f47
font_01_sfnt_off0001203b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203B 11160 bytes
SHA-256: a43375ebe3f81f545a0e4537dd063628c66b8cfc6171af9a04544a32a14e7450
font_02_sfnt_off000139df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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