Malicious PDF — malware analysis report

Static analysis result for SHA-256 310d11d4b592261b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 14:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 95ef0dc96834f0056b38694810dcceed SHA-1: 2f2ddcfcde244f6dfd697a28566c967e4782aad3 SHA-256: 310d11d4b592261b11871bc7138ffb277030a529b2653463f76d5c3232b21bcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. One prominent URL, 'https://allytemp.ru/uplcv?utm_term=ios+14+keyboard+for+android+apk', suggests a lure related to mobile software, likely intended to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=ios+14+keyboard+for+android+apk PDF link annotation
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161369d66d7ce4---24326555272.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210909035604_ODQzNjEyOTY4NDU=.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/vaxeneg.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-2/20210902094949383620.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/mofigosudez.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/rnotrctqhle145mu4auj97hoa3/15192234026.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/5594522671.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/vumemuxebizunezemevab.pdfIn PDF document text
    • http://k1a.ru/images/files/file/6436883560.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/239645804.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109050248405967.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/79696223382.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/ribuxadadag.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca5f4b005---4523612914.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/26a1724b1f783e0e28820bb738608329/fobate.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/dibezujokuta.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210909162025.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210908081740.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/bofafuturugolasopun.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/28718497678.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/fafariduxalosujiwoxula.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_off0000d093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD093 20280 bytes
SHA-256: 9d85666c5f4c03046c71df423873ae779e6b2fc62c827e366980173af3d40a31
font_01_sfnt_off00010568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 10776 bytes
SHA-256: d3c2afc2731622cf3fc9a21d29df5da5d514d6569e2294f112e35e6c17d75a6d
font_02_sfnt_off00011e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1