Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d390888c1483f6…

MALICIOUS

PDF

83.5 KB Created: 2021-09-03 08:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 5f6671fc10c41fe01225e7f11bcc9111 SHA-1: 590cc45c4a162899be2f7fa4c1a9ba77404b5cd8 SHA-256: 67d390888c1483f6062f6daf8209cb5a5cf6f57495c3f6d3a2c0d61637929b14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://castrolmintabolt.hu/images/upload/file/xitoxet.pdf In PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/16555705315.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160892e659562a---xuzigakaladufiduxilo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7355b7c8f---tosefiz.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081ca7d434f2---lapuxerilubeki.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/kepirakilezaf.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086aea3e2a00---figosebasuxifajuze.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/45230801614.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/seribivabuf.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/fe68ac65bb3ba6947c497b6edd3f6114/vijawoze.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/32589509380.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f69cd7bc8---pinirebuwumanet.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/fmerlsstpn8l26r43vd5uk6bk1/25296186082.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/15033644317.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/xutapu.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/40687276749.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/30528740611.pdfIn PDF document text
    • https://ahha.az/userfiles/file/bakixivafobeputukufoze.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/kiboxesivuzagevagiv.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928b5fc3e0a---7810036953.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/63851044473.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/7738842461.pdfIn PDF document text
    • https://airshow-bg.com/file/40936656260.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/p3mffg9qovphq4or20hl6unsnf/witonuvawuzu.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/21090201535591321572yi3.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210620191042_1149858912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=best+resume+pdf+free+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_off0000e1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 10804 bytes
SHA-256: ac48f46c44c0c1c3dac1738b25e1bbdc4da3fd7fe836138957a5a4b1d2acb2b6
font_01_sfnt_off0000fadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADF 17276 bytes
SHA-256: df2fbb3eae5c7c70a67c9c1313c32f7804774517ee4ca9cc68afbb0fe21055d2
font_02_sfnt_off0001284e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1