Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e03f001625903b…

MALICIOUS

PDF

97.3 KB Created: 2021-08-06 16:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 028a8cca7542a90998af4ab87a8fc098 SHA-1: 42c603cf608da2e8fe609ae656e010b9fcc03bff SHA-256: e2e03f001625903b7793edb2d2bb8d272b73d4d9a2991a5c066bba1b2a41b6c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics point to the document functioning as a link farm, with URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the ultimate destination and evade detection. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://solee.cn/ckfinder/userfiles/files/67333788386.pdf In PDF document text
    • http://parvazyab.net/basefile/api203/files/93256912190.pdfIn PDF document text
    • http://teplospectr.ru/images/files/54070724625.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/btr6nqo5mmf2apq8c0l9s74b7h/51839519627.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/lukegixozakuzu.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/jaxuvutikaforaxokovafoxa.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160707d303fe66---zexopodobagamab.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210701005031.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/16551661906.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/sozizelejidobavalixuj.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c5260d039---9891880903.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/21624554616.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/b2c57a9ae382d16bbdb65e3b1e62ae0e/dixotatiniraluwolobudi.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/jamobegibejes.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32fa789f7---xakanakemeg.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/kefof.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/28742286667.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/588b3d99df822e0b25d7cb87a5a0ecf3/26972385969.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/g54p56c903jhbo87gn67lcsqr5/84856194508.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/84339123112.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab700ed06a0---19694787177.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3369153df---goxifiviluxewuxo.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607544111cdf6---62964700669.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/54281531b775ee60900d3758cb77caff/86591753304.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6682424827---xisajuzi.pdfIn PDF document text
    • http://fygl.net/uploads/file/300743268944.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4260a5cfd9---60426270801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=does+kyocera+duraforce+have+wireless+chargingPDF 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_off000114c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C2 11116 bytes
SHA-256: 5d1cfb9ac59d134025f9b0125169c86cc76bfe3e0603265e04c2f2aa509e2ad8
font_01_sfnt_off00012e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7D 17744 bytes
SHA-256: 0564aab19e5ad4ff76b995c4b3554bc92ac67a2f9b45222938a045ad19bbaf60
font_02_sfnt_off00015d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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