Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d72f6252a894e39…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 22:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 7a5be18ecdccf6832f8e0ed11b968000 SHA-1: acbfbe995b386a4b62dcc56da05bbc8d6f369a36 SHA-256: 1d72f6252a894e392798fd12de581d4f2460089baed3d3d86a1a41a6092818a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://espokebar.com/uploads/files/57091667660.pdf In PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/doxorinuvuwaxosopodir.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/14853108504.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/24895532842.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/jomezedamaxijexexamigaba.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/40409182513.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/rukivup.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/65874383238.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/7332100371.pdfIn PDF document text
    • http://hocomesun.com/upload/lagelanubu.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/26263992981.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/wixebeviv.pdfIn PDF document text
    • http://decorstore.eu/upload/file/lojuronokekagadodowukawut.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/fumime.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/37870528420.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/xeluwebukijuk.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/84617024141.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/nagolasofevimujapegamipar.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/bakelaguxu.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090804093973499.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/83783362775.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/dc720d6c867492af5073206f5e00e72f/8682220405.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/195b96d8024a368affd79e7c678c6707/nuzuj.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/ridabog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=5+letter+words+starting+with+rPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/9f13e70986734d01f021cbe93796c55e/zibosule.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_off0000df10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 18680 bytes
SHA-256: 3fcf4743faad263c85737ba16c1f5a8a4047997455a5a10425bbe81123618cdd
font_01_sfnt_off00010ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 10652 bytes
SHA-256: 05be05ccecfb70be1bb677b0a0c32d831b33407e19d128098eb395830920cc70
font_02_sfnt_off000126ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1