Malicious PDF — malware analysis report

Static analysis result for SHA-256 16dc0f3a925b0118…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 03:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 53678c44652469510b933575d674a9bd SHA-1: 964d15cb25a36308b6c7b6d3ea335096cf3151e7 SHA-256: 16dc0f3a925b0118490c68751eb8fc6cb310668e33a1b972cd693ca64f0132ae
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to exploit vulnerabilities or execute malicious code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://camberwelltaxi.com/survey/userfiles/files/65572094765.pdf In PDF document text
    • http://volvo-cars.jp/js/upload/files/nazido.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0fc8a8f23---gosogowovatepogixoxa.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/xugewabo.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/44873117360.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/5948475322.pdfIn PDF document text
    • http://eko-uklid.com/files/file/sotozivodikozodegivurot.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/72261857797.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a9fd61cca7b5370e795fbf89f5ad01cf/17155725394.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/narotinaxizigosum.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/nusubelu.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/maxebulolumuwazotekorexax.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/71430303556.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/bafeluwikovogeso.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608460751cbfa---77021808824.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90f670547---zezuvi.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/49456454666.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085de041ec90---wowom.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/20357724982.pdfIn PDF document text
    • http://jonesfamilygathering.com/clients/2/28/28a2af4908f4fae7f70f8b91082c1e08/File/wotejiwesezek.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/r4hvop7a1c94diur0hihal8uqe/40130900092.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/9419147413.pdfIn PDF document text
    • https://najarshi.com/basefile/najarshicom/files/filuzunu.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/16462102505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=enid+blyton+novels+pdf+downloadPDF 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_off0000dcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 17880 bytes
SHA-256: 6d17490ccc822280a4d9e9d0e51e73716d850cd7b9ba06c764231ef2537b8067
font_02_sfnt_off000123b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B4 10780 bytes
SHA-256: b0160debc5e9b0e8e0e62e8d6f08d33a40bab99e356a145a685227b916300016

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