Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4ec0ecd446afa7…

MALICIOUS

PDF

77.1 KB Created: 2021-09-20 10:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6146ef49d0feebd222b67c8c4cc4eb9 SHA-1: c67f52f996d574e024a9441f717afc6f67949c4b SHA-256: 5b4ec0ecd446afa741f5fd892683878892b018a97596490fad75d63e7a084c65
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, some pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://polaria.cz/images/file/jenesetunuzomir.pdf In PDF document text
    • http://bielle-srl.com/userfiles/files/73509492311.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/40852821278.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/dejojajiwanozedopasu.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdfe666e72---56463042750.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/bejexizetivoxitubidu.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/resamoze.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/42304131416.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/81451517700.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/nenuzexaginilawexugo.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f402e55cd5---kixatosifozanefepodinud.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/60892133170.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/73214157715.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/narigobobefuwi.pdfIn PDF document text
    • http://happy-land.hu/editor_up/36160346254.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/b9da106d0a9b3a2b8ad8634a963ec111/54799272629.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631121597.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/82149891343.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/wizidewuniwekaxojig.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/96705977707.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0c2a5a3f0---baganazimu.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/81242714095.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/kefilopewakovuf.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202191101525089.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/bemigadir.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/o01athu3j5u4m4ngr11s2janbd/46650240342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=warhammer+2+total+war+trainerPDF 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_off0000c962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC962 17580 bytes
SHA-256: 3c64c0bd459826deb50298a1ce7f7dd615245393799d9220051a93e5cc86d57c
font_01_sfnt_off0000f6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F06 10404 bytes
SHA-256: cd9e7d50380ac0a34e749e358314ee3b0ea51d9064af325513abeeed7e8ad0c0

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