Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac3cc50709872b6…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 00:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 418d4025e5eaf4411eb1d7367cb47723 SHA-1: d7e2c25a3b760d2a9248560a5a875c5f256d9a99 SHA-256: dac3cc50709872b62db3a35f1a83ecc439ef323c0ecfb3bf105ea46c64de8767
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which are part of a link farm designed to obscure the ultimate destination. Several heuristics indicate that these links point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://vico-inmobiliaria.com/ckfinder/userfiles/files/82465041902.pdf In PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/38389522054.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/81917788420.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/31815077258.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/mitanibodisaleji.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/49061743272.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/2237949812.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614becd8d4d79---80433977822.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/figakogawefafuret.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/waliriben.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/sajodudororolav.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/wesubij.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/wadoparud.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/555327606.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16150e180bbf04---kanivirona.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/94942531551.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/kebipabuxofufubisizovile.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51395635429.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614664dddb19a---99730345809.pdfIn PDF document text
    • http://gewald.ru/content/Files/95347433029.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/koweduvoxugegavaf.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/gajoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=download+werewolf+online+mod+apkPDF 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_off0000b13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC954 10572 bytes
SHA-256: 7c38fdbc804f5d9375eebe5a55290fd3155caa27edf3c74e89b04fb886e3466c
font_02_sfnt_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 16068 bytes
SHA-256: 492e5d7a11b243f14b7f3b3e199ed41034ec5c421317fb359136dd7da06adf15