Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9caffeedc8af90…

MALICIOUS

PDF

89.4 KB Created: 2021-09-12 03:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c57998ced193879e40b480a454ede4c1 SHA-1: 0c3a56dd156d157ba2d3411289639affd12febd2 SHA-256: bf9caffeedc8af904065387e1169d1300bd7c194df331042f06405429f4d1ec7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm or phishing lure. While no scripts were directly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://amrapalispot.com/userfiles/file/91994399191.pdf In PDF document text
    • http://matras-devison.com/upload/file/49568732360.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/71982166014.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161341f95c63b6---18857828117.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/25620145903.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/42236641019.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161343436ee0d2---xavimavalivono.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/59860543172.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/pinekajiburibima.pdfIn PDF document text
    • http://fitviewer.de/files/file/wiwifagutigenemil.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/tameluredigesol.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/8bbiip6ok9e4eb8l54suhurk71/23682694415.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/4072275117.pdfIn PDF document text
    • http://one9five.com/userfiles/files/93285744899.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/57609687261.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/15935808926.pdfIn PDF document text
    • http://www.pilartangguh.com/file/81349077404.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109010607543911.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/pofogogotakerinonikapo.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/werepelekakupewisegav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+change+sim+pin+on+androidPDF 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_off0000efa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA2 21080 bytes
SHA-256: 7f2a30dfb3c70f1c4ecdc37b360ef144e4a35cf5be1ae00935cbc1b32ca3fe98
font_01_sfnt_off00012705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12705 10992 bytes
SHA-256: fb9ff4a6583a2008bdf5db68c63fac88e9df505514e0694b8a5e4bc465892c0d
font_02_sfnt_off00014032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1