Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca51a724d25bfef8…

MALICIOUS

PDF

74.4 KB Created: 2021-09-08 13:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 65560c9db3546ff35042eb495f36a65c SHA-1: 38a26ff0c562833667e1ce613505e7f6e3e09ecb SHA-256: ca51a724d25bfef8692070af4671b1db8fe8c7ffdee043a8aa16912a89041afa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Multiple heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316d655c27d---dowaweguzunibelabunibi.pdf In PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/xugowufe.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/xatozakiwesafinimeliju.pdfIn PDF document text
    • http://runhouchem.com/upload/files/86359559206.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/wezivozawafajar.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/lodurugowifafola.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/dolagukano.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/beguvilipam.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/55121886626.pdfIn PDF document text
    • http://isvpro.com/custom/files/8984133211.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/nokuketese.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/if2egnbs3nipu1cq6773ljrqr4/91278891794.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee6fe612b3---10503188569.pdfIn PDF document text
    • https://nexusmediation.nl/files/94887918214.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/35744724881.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/72638117796.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/xelelefuk.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/rititipuvupofoseziw.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/61773426927.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/tuweruwikijur.pdfIn PDF document text
    • http://balone.net/_upload/file///lawepuvozekotopala.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/51210685009.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/josopetutoxikoxu.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613784ebae7ed---nanepadosolanejovi.pdfIn PDF document text
    • http://tchid.net/userfiles/file/65026862418.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/40520855359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=dividend+discount+model+example+pdfPDF 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_off0000bf3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD755 10948 bytes
SHA-256: 4a33598479e3dfbc2466bd2054f701976a5d4654a86bb06eef00878862fc1ba8
font_02_sfnt_off0000f0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 16760 bytes
SHA-256: 7f915390a17bd88c4132773e05a6225c92f798d74fea455e677d4cd43afc2150

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