Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3193c863bac2e4b…

MALICIOUS

PDF

75.6 KB Created: 2021-10-03 03:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9af8d98f961e341061b8af3a2fdc30e1 SHA-1: f77aae5fc4298f0246c6887a4e296ae94e456579 SHA-256: a3193c863bac2e4be0e25754a3f076351f1d76afa9ab1d4e1482f4e886d3b274
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://belean.pl/userfiles/file/39819019787.pdf In PDF document text
    • http://mannaz.pl/userfiles1/file/87009281414.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135f3681a633---79967325424.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f584e9dfb---45712702355.pdfIn PDF document text
    • http://www.rarlaw.net/siteuploads/editorimg/file/15625453514.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/lexiwi.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210929075847.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/42fe225f4494b795406eab7a919db8ef/77172968123.pdfIn PDF document text
    • https://russiancosta.ru/ckfinder/userfiles/files/58282007184.pdfIn PDF document text
    • https://thietbigas.net/media/files/lelowenenineturi.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/fatubi.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/57512895571.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/126ea61a7c64831e676f6f9268368228/kebavulizotapakekexu.pdfIn PDF document text
    • http://gazetavk.ru/img/file/48150750401.pdfIn PDF document text
    • http://carszana.com/image/upload/File/wurewezizimekibizowigo.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/18437716692.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/43008902578.pdfIn PDF document text
    • http://simplehome.ro/ckfinder/userfiles/files/73022064794.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/42630309295.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/42820389024.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/visinifolovabukebom.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/70232091362.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/xokodudexopozusujodosow.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/22658363077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mccloud+butch+cassidy+rides+againPDF 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_off0000bba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA9 10996 bytes
SHA-256: 8132330dbcc45b405a5a0462630c3a12ad9457bdd34c1658e4402475adbcf700
font_01_sfnt_off0000d4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FE 19612 bytes
SHA-256: 0606d1f1211c58be0eafaeb2b93b647ac47d8a52f71d2ec94df81bab48e51b70
font_02_sfnt_off0001082e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1