Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b97e0519ddc0bb…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 08:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 48a917e8bc4bd1191a94e7a15bd903f0 SHA-1: 59ea47dba112e33ab082119edc8efa2571cb55f1 SHA-256: 44b97e0519ddc0bbe8b0204df4840e4bad7adb6d9338fd51649ea89e97f8b659
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan-d2568dad23a94d95. It contains embedded JavaScript and a link farm pointing to various external domains, some of which are hosted on compromised WordPress sites. The presence of JavaScript and the link farm suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://abdon.madteam.net/ckfinder/userfiles/files/xibenawopebifetinap.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/1993731195.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/15744930462.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/b345fe90d9057110d61c6df52cd51f57/vediki.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/gonubusu.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/famaturufojelitajori.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/vivinu.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/36456414834.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/sapunepubu.pdfIn PDF document text
    • https://aashianarealty.com/file/danol.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/49716182466.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614920d5299e7---miwovazuv.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/kapoxenobatesimuj.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/jiwew.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/zovegenivojizulomulofajo.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/xusinurukawesefawazodek.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/86713940449.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/powajugavike.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c9da2473e---75090144763.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/29797154033.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/17227131799.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/97227968382.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/gabudepugupusude.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/wexebixanexikabamogo.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8ec14f070a7e57cef3a58e711d8f0b7c/zapebovoda.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343095c3a32---tavajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=unbeatable+chess+strategy+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_off0000b163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB163 14968 bytes
SHA-256: ac03316faa2e8e61aaf2ec790ccff4cd831ca1e015797e2b1e8d19129d47a843
font_01_sfnt_off0000d6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FA 10948 bytes
SHA-256: 030dd17f0946842a5357bfa9df0a6c6b2c7a667e6c6501514b130935956fffe1
font_02_sfnt_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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