Malicious PDF — malware analysis report

Static analysis result for SHA-256 b355344ab1a85875…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 11:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7264c921adc325ab83497ed6e007a8fc SHA-1: 7f44624ce79e6225675be4b613cb10690cff8e4f SHA-256: b355344ab1a85875be23087ce25ab3606babfbe763901b8d243ea00657a1b8a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to obscure malicious destinations. ClamAV and ML classifiers strongly indicate malicious intent, specifically classifying it as a phishing trojan. The presence of multiple unknown URLs suggests a distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dbacdf10c---lenodomugi.pdf In PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/riwositel.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/6770100381.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/valebimokaroloxoramiw.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/gexolujom.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/51348385749.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/zalukabupejer.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/puwara.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/44692369418.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/85254334144.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec1fd040ff---zasixogalukovepomixen.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/37349736022.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/vewidijov.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/kipoguduvolezo.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/94672890983.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/zazawetibakefisaro.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/63671823155.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/nedurobisodog.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/58701170985.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/rqt0j88oi6b8lkrcnigu81u6mi/bulojixor.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/kaverezerasozuguzedojuga.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/500eb72f78529c4f27dc327df4be1137/muzobelota.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/30398459603.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142955154b89---ramopon.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210901_119D5AD87F834018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=puhe+tekstiksi+androidPDF 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_off0000da48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA48 10492 bytes
SHA-256: 1cb7ab1165212f56f0fd00a919205f9486661087c43f964661e61a7fb3f569d0
font_01_sfnt_off0000f228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3A 16572 bytes
SHA-256: 8abab7d241e78dd7fa18cb4b4356031bb36834ae8a9a146d7ea2737622fef26e