Malicious PDF — malware analysis report

Static analysis result for SHA-256 daed90f39d263e79…

MALICIOUS

PDF

76.0 KB Created: 2021-09-09 18:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 06cfef84f8b617257433793f9c4af8ef SHA-1: 67e1e6bf93ddb45420bff810ac9a649cebe3c1a8 SHA-256: daed90f39d263e790ed5f70ddfa7e2dcf88febb9ca4b00949c935a0fb53b201d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute actions. Several heuristics indicate the PDF is a link farm, with many distinct hosts, suggesting an attempt to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.alexgis.com/siteuploads/editorimg/file/7500290577.pdf In PDF document text
    • http://runhouchem.com/upload/files/bopajomipeb.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/77001824264.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138666399797---41502233709.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/witebimajivenopibaw.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/63540388068.pdfIn PDF document text
    • http://knipia.com/userfiles/file/39653806131.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613835adc4566---lujiwopeluweni.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/93515995249.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/midazemizikep.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/28200323519.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/15751285582.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/jikonudajotulerer.pdfIn PDF document text
    • http://caythuocnam.org/images/files/jevofogizo.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/d80988cbb91a58c203aef9ecec02d5ae/vaberomorojorebezeti.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/2957835443.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/maxarasus.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210901_32B3F4B56084F73B.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/16310881261.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210906_010534.pdfIn PDF document text
    • https://digireg.cz/upload/berofupusukavutexa.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202195_7181_758.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210909192139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=kotlin+voice+recognitionPDF 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_off0000c279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC279 10132 bytes
SHA-256: f5ab3afbc308ae3a7f312d88fd8713503a573bf07d4ed9116982dedc40f078c1
font_01_sfnt_off0000d937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 19036 bytes
SHA-256: b103ae7f9540d7a461a33be94746eda07b6211062da61e41f39e63e815909fff
font_02_sfnt_off00010abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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