Malicious PDF — malware analysis report

Static analysis result for SHA-256 352b0a69c7b889d8…

MALICIOUS

PDF

90.8 KB Created: 2021-08-21 10:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f49a9733dfae61d12ab233e82afea2c9 SHA-1: b507db85cf7e1b5282e13d986c434d784b2348f8 SHA-256: 352b0a69c7b889d872fc6ade0f4d7d4d7857675787d14f7a25e4a34ac2ad2579
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to host malicious files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. No scripts were extracted, but the presence of numerous URLs on potentially compromised sites indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://coretry.ru/uplcv?utm_term=como+crear+un+servidor+en+minecraft+pe PDF link annotation
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9cf03bd3759198a355c725889b7c3263/96296129304.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/gedoxu.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/dudetabefaz.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/944ecd74ce46dd3ddada35b95240c83b/47221347420.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/pikelamapalaguvi.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/bogesivipilufu.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/79701632924.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/679587803.pdfIn PDF document text
    • http://centronegozi.com/public/ritagavabu.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/wesifotalewiliku.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/32033273102.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/bd1c24f99e81dac9334b91d14545456e/25123730641.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e753693a72---rebumutig.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8657a133f5---xememekajunevate.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55297d6966---1847353741.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17313ce462---vonifu.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/91062849526.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f1689f62dd41d8378d6524d60283e26b/84635260070.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb2f395305---32181659605.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/56763686002.pdfIn PDF document text
    • https://wildnaturetravel.com/File/54192884669.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7cddf0002---87858833837.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/3057067810.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/79770141764.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/bovasawusutibavopokidej.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/ziwovipugakif.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_off0000f863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF863 18704 bytes
SHA-256: d0444f090917d0ef2a6ead6727d24b09158ab5e44b8ba8a00548bbb6cef7addb
font_01_sfnt_off000128b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CD 10932 bytes
SHA-256: c9c8dedfa3aad5492a288b1031ba85fd7632b46e0788c9281fbc2ad64c279862

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