Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4d3347743869e9…

MALICIOUS

PDF

78.0 KB Created: 2021-09-21 23:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9a331851378348d9b0ff4e06cab7a438 SHA-1: 1a7e377f0e89437e93a2026624813fa9aec6df7e SHA-256: fd4d3347743869e9536d577e654c68d6dabf4de91a62c08be563aea86010be94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to a variety of domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a link farm designed for malicious redirection. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://cructi.ru/uplcv?utm_term=anonymous+chat+apk PDF link annotation
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/6acb814a7bb8c7884eee46b4a79c05ee/vanon.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/30334563998.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/dalobevopikalakuregofapi.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/81197189925.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/zotexijojogoraboguvaribu.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7427080b8---45708129847.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/zevaxusibilorewer.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/datoje.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/dorilugevis.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613543b05509d---2819348698.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/besakevoxizututusebewakex.pdfIn PDF document text
    • http://findusafranchise.com/files/files/dibebipo.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-14/20210914040725670153.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9deac65e7---pivipajen.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/66200642818.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/polumuzagedufi.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/fepisowe.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/xotosemogejegiz.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/72310705953.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/94450544343.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/73197799973.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/maginoborogaxiwixerobajap.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161488785c0ce5---fazevude.pdfIn PDF document text
    • http://talesma.com/E/file/10831224915.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_off0000c92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE140 19200 bytes
SHA-256: c704d61c1c89badd7b1b99b419c86c75533780c1979eb8ed3ad65b3db7326991
font_02_sfnt_off000112d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D1 10556 bytes
SHA-256: 04d729f5a28135c3c14cc4f2b6680ff723c2915ba965a5c14fdabf91a1f43b5f

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