Malicious PDF — malware analysis report

Static analysis result for SHA-256 d926b1acbb326e82…

MALICIOUS

PDF

74.5 KB Created: 2021-09-02 16:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8821ebaee0df2ec54e24b9e86e2e8842 SHA-1: 1b0618e8145c78db9dc34ac4664a0581b8354c5e SHA-256: d926b1acbb326e82c3490a83adf1f2adc9f2db77ae68d1cc6350cad23bbd8171
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, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that the PDF likely acts as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://smidgel.ru/uplcv?utm_term=current+affairs+2019+in+marathi+pdf PDF link annotation
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720b236c00f---zulemujuz.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021080606010373499.pdfIn PDF document text
    • https://soltendance.com/stockages/files/69231064529.pdfIn PDF document text
    • http://medrea.ru/upload/files/35630114347.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21e3490b93---56490172844.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/0vgk9cgaoso47of33olfo2kf6c/rujifajimiwexuwafenus.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/balapibuno.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/mubotoferapav.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161176f8ebc646---tulixi.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/kibufomovoluwajo.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/gixerofidugisalonagajo.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/49222113567.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/51720204854.pdfIn PDF document text
    • http://wisewood50th.com/clients/3/35/35ca2b70ae131fa39667c240906a3fe4/File/fejebekugasixojebazepapo.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160869125e793d---sataxef.pdfIn PDF document text
    • http://jaqalsports.com/files/file/retikil.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202108100613527071.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/7d391b5b3d8e28d5d8cc778ab2ff1cc2/lomozobu.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/suvoxunonogosobidiwafima.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/jogavefuriti.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/34628717525.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16117975b31749---63437740342.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/72216549772.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/aeb1632848c4f449613fc8c0e3e60f97/zugeninutitazuwotuj.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c303eab28---jikefevowemefotikamur.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be93e06da21---18244299877.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_off0000ba52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA52 18396 bytes
SHA-256: da1f6404460dea7b6374e2effaa0857820ad6b29866926f1209a7db939450833
font_01_sfnt_off0000e9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101ED 11192 bytes
SHA-256: 1f2e2ffa7458dd5e604e42aa2c502083e92abc1656b5e7fb27a1ac0610edbaf6

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