Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e25698291a04c82…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 11:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e58ebe6d77328bc984f4d88862048df1 SHA-1: 71081b3249ee6d4d32fe090342a5aaf3392c8870 SHA-256: 3e25698291a04c828563f17e8354ca17d11fd25ab8f7f6a5c1e8a5190bda4b8c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The document body is unreadable, but the heuristics indicate a link farm and potential QR code lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://runo34.ru/attachments/file/29391321341.pdf In PDF document text
    • http://forepic.com/_UploadFile/Images/file/72423541433.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/54634533844.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/37634250750.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/buwuxuwifukonazugikamug.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/65766076877.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/fafuxewopavunojomuwaruno.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/gepavo.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/614a7cec0b801d55dccdb55f853c1f65/fimizowibadaz.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/luxufiweruriduxupux.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/dufidexuraveb.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/1371039666.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/af8516b1f5a8e2cf2b54f3d32bce2dcb/36627135532.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/95107652342.pdfIn PDF document text
    • http://bienbao.net/uploads/files/63670385555.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/kusikimo.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/dajajive.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/libenurovokuzukuselusus.pdfIn PDF document text
    • https://questyme.com/userfiles/file/xekeworisukot.pdfIn PDF document text
    • http://packturf.fr/files/96728290727.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/75572922450.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/fotadadegadosorabodus.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140436ecf093---peresuvininusanuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=comparison+between+redmi+9+prime+and+poco+m2PDF 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_off0000d482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD482 17376 bytes
SHA-256: 60cf9406654cd2a5d20f7798ac5922c2c7490684a9f447ae64787891aa6b87b0
font_01_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E8 11172 bytes
SHA-256: 7ad766c5e63964da4056460c10576e48fc241ed0787f84533d20a2820c860511

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