Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a96ee14310e6e0…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 21:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0d9f254a864d03fc82c1659966adec41 SHA-1: 679f72b22c85881b2bcffe69f2d68852ec47d120 SHA-256: 20a96ee14310e6e09f8d18042cbe55371689d5cf5a5b057e5ae7e99cd27f0b60
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. It contains embedded JavaScript and a significant number of URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript is a primary indicator of malicious activity within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://catamma.ru/uplcv?utm_term=overleaf+includegraphics+pdf PDF link annotation
    • http://creaorganization.com/depo/sayfaresim/file/59051507504.pdfIn PDF document text
    • http://dnepropress.net/files/file/50140785781.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/naloxewarejo.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/30427588839.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/67246197964.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/5f73925b4c7ebdca6d8cf51235ed3811/torupajus.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210708110512.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/99193239681.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/kitijoduwawabonobex.pdfIn PDF document text
    • http://timesofbangla.com/uploads/files/sikakawujir.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/rofipolimujusuxifula.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c24d23610d0---2793961756.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/xadikudasirikirerur.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/64815614832.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/neguropisopopige.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/54542060954.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210524090401_585958373.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/65610408253.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/mexosesomoxixesinapida.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7aa3e5dbe---sevudifexawipo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079248916f92---fegobakiribepidetefi.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/rasigobepu.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/70847073078.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a45c2c816494a5d90fde6db2d2cefe70/19624634198.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/71a659476d8facef688430e072a20b46/12066979877.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/gamowadijafukedunabad.pdfIn PDF document text
    • 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_off0000d570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD570 10872 bytes
SHA-256: 044202407d1582a2828d89727f1ea3a2574992853261a2ffc61836eb18a93ddb
font_01_sfnt_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 17220 bytes
SHA-256: f75032b8af4fc7ab9413a63fb0ea89d166391d69d2e350bb1a5ccde3b56ae74e
font_02_sfnt_off00011b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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