Malicious PDF — malware analysis report

Static analysis result for SHA-256 9acd52e03cd4ebcf…

MALICIOUS

PDF

68.4 KB Created: 2021-09-04 06:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f0b54591a926a2d53788a3b2398d93e4 SHA-1: 9bd64a8d5e0434fc06b9ccd042a43badb3e7f2ae SHA-256: 9acd52e03cd4ebcf5273c0c1f27549d7c4a89bfb056d9886a72f3a4709c96e85
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, heuristics indicate the presence of a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content or phish users. ClamAV detection and ML classification strongly support a malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alternativecarrepair.com/userfiles/file/lupoxurevubuvejajiforen.pdf In PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/9195746294.pdfIn PDF document text
    • http://spharma.ua/files/file/wiwixipapofipejorivop.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/tagugar.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114abd9c787e---ropujofu.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/230987592.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/22989666753.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/nivurilatosalebuti.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/bixufubazagu.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612666007e446---xogolodoxofanubudagonina.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a2c713dbc---93166975337.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/bafirevepozojamexixi.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/suluvodelenifalasafaraja.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/92f60b1123ff9fc29bd7493a1729be0c/xinajatojadolosakiduj.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/28315974876.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/laxokojitozujexilota.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/netininuk.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/76916619890.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/28767703835.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/vorimirejiw.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/gojevuzogevosiwono.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/93835230895.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/vavaremomuzuzibotesix.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/fipijozosilewot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=rain+bird+iq+manualPDF 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_off0000b030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB030 10320 bytes
SHA-256: abfae950cb41026358ae5ece26c1310031c05dd95f85903b2ad89fd4e01b4507
font_01_sfnt_off0000c70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF20 14576 bytes
SHA-256: 2a0b32cc94a3871e074101e19d699d09342e6cc3006c9a1432d96f3e53fcf718

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