Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2d8c3b8b46d629…

MALICIOUS

PDF

70.0 KB Created: 2021-09-13 18:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 52ed3b3d1830193cb657748b39c256b7 SHA-1: 74fac0587a5bfdfa94e87987ad94daa2f70af3e8 SHA-256: dc2d8c3b8b46d629bfe9c85f2703d690b0436e751e26b846c997a150efd14203
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on disposable or compromised platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports this, suggesting an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 http://pc-driver.ru/userfiles/files/64011778639.pdf In PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/46018199264.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/lafonotigisufimaw.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/bopavesozulabunigas.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/jotetunadazuka.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/nuzumenilunov.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/mulugulobafazejipu.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/saguwijuwavasipepuzabiku.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2ba05804a---gorobif.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/xasegerujowomudutimavuwod.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/f71fd148c5a4d0b0d9db372fbd75a02d/kewikalozojebazuwojos.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/tozixiritesadikutex.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/newanemovitov.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/6962493940.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/90578780158.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/48809673994.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/56610061743.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/7559318785.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/gusala.pdfIn PDF document text
    • http://sdds.be/userfiles/file/jipobuviriwolidijenubal.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/57ad64aaa838c02c39d67d71c84c75a0/wazowimenikenarivozagagi.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/rebogatujodo.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/zigasutisele.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/tepitilowiluvapowodamade.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/35643250617.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/banefazekererekeleta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=gamecube+emulator+apkPDF 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_off0000b4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF4 10540 bytes
SHA-256: dbc501b8450f357a74124fae7e2acb7d18c13ec9a9680a839880c2c89df66a4f
font_02_sfnt_off0000e4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D0 14844 bytes
SHA-256: 2e00e37ded4eb2841ed82dcf98f17a51a9e56fe835b72c8e33865b4bb62b3004