Malicious PDF — malware analysis report

Static analysis result for SHA-256 d923461c232b6ca2…

MALICIOUS

PDF

85.2 KB Created: 2021-09-07 03:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fbac2c64ff456957c6e6d06ce89b704b SHA-1: 57ce971f691da9049d17a96b5311e8d4e1ff5521 SHA-256: d923461c232b6ca246576dd04522b736f89aab48a85d393ef3c8f2d67cc6bb47
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to exploit PDF vulnerabilities or redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tenutaedone.com/filesUploads/file/vabajikevitamelirop.pdf In PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1aaec676fa---45473061643.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/84449316698.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ad4e7a336---16345209528.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/puzufuxutusepa.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///94649505098.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/4ba871d05c44aadbda774d3ab2b7f1a3/joxorovezoduxesoninizo.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ab54173c3bb---gejofomumosekojuvenomule.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/kapij.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/18675779451.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/wixuxanefofikatazeko.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/riwiludebuvadaduwixexeso.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/85982140709.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/sugebitemepexexulupivumez.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072083136fad---26180256778.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d30c9216e4b---48830891426.pdfIn PDF document text
    • http://www.siposferenc.hu/html/46375720555.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/45451838372.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/2ed30da4f30a0d2f739fb64e30a95916/xusubuzepasesojiredaf.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/53608777657.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/wojafal.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1b3473562---96187454273.pdfIn PDF document text
    • http://webursitet.org/Files/file/68557152366.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b13107c5d---96935982874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ibm+aix+unix+commands+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_off0000e77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 10700 bytes
SHA-256: ece77c80e59016053ad0b278a54159a3cf2975026cd97e7770f0415130649563
font_02_sfnt_off000117db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DB 18276 bytes
SHA-256: cdd2ec5e1e93016b4dc1cd28e0b1e29e83ecbf576bb755d7db3f4c2e4ce62439

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