Malicious PDF — malware analysis report

Static analysis result for SHA-256 767c57f79ee876bb…

MALICIOUS

PDF

81.9 KB Created: 2021-09-09 06:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 32ef50abec8a4ecc832ad70221788f2e SHA-1: 610b7adbbaaee2363604c8f609952862c5be0e41 SHA-256: 767c57f79ee876bbdd7af2ead5748a449df38841c87322a12f44fa8ed52dae96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to disposable hosting or compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the intent to trick users into downloading a payload. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://grafichesirio.com/userfiles/files/newasoratomalewemebaridit.pdf In PDF document text
    • https://gilbertems.com/videos/file/kakafuvegovonuzexaga.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/pajolapufexarir.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/14718729429.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090219235873499.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/96681517155.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/rizejejazez.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613947d0dca2a---51149340405.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/dufuxikibifivixefiw.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/20e3b55359288a653363599a1b2219c5/kudowosuzod.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/fupaxajanip.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/jokotalepafuzabebepanezud.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/xozifitatubapopuvoseted.pdfIn PDF document text
    • http://ippon.lv/uploads/File/55581952745.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134289d3508f---vaputel.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/datoxerumubavoxovopoma.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/koluvupadodewa.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/durenapimizabogiwinu.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/8883684022.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/32896814515.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/selapowawiwutaneluge.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/42252145691.pdfIn PDF document text
    • http://idroter.org/userfiles/files/51965081243.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/tevukujegabaxuna.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/16950007846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=jetpack+joyride+hack+ios+downloadPDF 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_off0000d98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 17972 bytes
SHA-256: 555da81d8eeed9719d675e4f6930914761ec70e9a93a6d78c3312dde43e5262a
font_01_sfnt_off00010834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001204b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204B 11024 bytes
SHA-256: d49cc90f550b6d41ad3e8b526b91221dc01e9e3d01eb6d7a5e5a2a6cab01265c