Malicious PDF — malware analysis report

Static analysis result for SHA-256 db75e93ca2c888ee…

MALICIOUS

PDF

74.2 KB Created: 2021-09-25 10:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bb5fba411dcc7156f4e8c71d5f9ea376 SHA-1: c57acb83d880b6873e171edd7fec6baed904e384 SHA-256: db75e93ca2c888ee13811f1386bf68f65e2727686dfdb9f0066c33739381a748
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=check+ram+on+android PDF link annotation
    • https://happy-playground.gr/uploads/_uploads/files/sijasekosarusopijidibatis.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/84211185136.pdfIn PDF document text
    • http://ahknchem.com/upload/files/waxeraretodonafatot.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386b76cd6fa---7924698387.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5f716c5b---lejawazatolatabazu.pdfIn PDF document text
    • https://sanidom.pl/img/file/nobebo.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/pedamadokagopasefasiz.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/4f9acaea951b62e1677a7408b6de7505/99704340600.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/5291958971.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/riwogikegadixoreg.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/87645588255.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210919085216630.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/dijisakoguzip.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/65820873287.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/98514997329.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/robog.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/38441032235.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/18697934822.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/lenitemute.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/97320412800.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/suteboxukipajugowetutezi.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a079e67eda---pezekofetudagasu.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/fuxaxumo.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_off0000bb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB10 10448 bytes
SHA-256: 61eaf9452df119a9e6c56f6571a616c57b93e4cbd90c2ade2960cbeacc814280
font_01_sfnt_off0000d28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 18892 bytes
SHA-256: 388fd6ec9379cbed48390982fb9c99b1934ce7df8781424807c5a9ad6802c9e7