Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e3d77d0e0c3fe8…

MALICIOUS

PDF

73.4 KB Created: 2021-09-06 23:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f77cbac28b08f50e7240ce460c71fec1 SHA-1: 884f5fe96b716e32812992255c24a0be291be063 SHA-256: 57e3d77d0e0c3fe82af6c9105351fb0a5dfe2e6048ce5e95782be311bd37be33
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

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 http://aucoindeshalles.com/menu/file/22663785534.pdf In PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/domomobuzerabi.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/kefuxegubili.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/jagim.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/18831697709.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/33485267281.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/91385581379.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/pusawebadimajadozi.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/jinebexuwumiwokoxixawozo.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/tigudalogem.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/wezulederi.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/sukotugemarib.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/gevebupel.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/xemevebegobunizuzodexowuw.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/50287515431.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/jotagimijot.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/galorenepowumixiretigenur.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/oh3dbeo6qonj2p5b30m82m4fs4/rototetipumajudobasi.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bae9d808fa---46855143359.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/77436990078.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e332b8eea5629d86cad2299884f4ade5/80836636605.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/xodolidivafow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=dorflex+gotas+bula+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/85240349687.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_off0000bd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD553 10820 bytes
SHA-256: 023efee6e1c94fe8a8759801878e4fa80d0ac65f081c419ccf65f2ae1f5fd09a
font_02_sfnt_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 16448 bytes
SHA-256: 6f1c3329fa69cee4b6f32d1c8f1ab87c35f6f23182241374d3f800b9b1560816