Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5dcee63bf3999d3…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 19:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d068508b233d7a9bc88448153dbad5e SHA-1: 6bfa975434d3341f99dbbedf5f7fd167ccfaf280 SHA-256: d5dcee63bf3999d384d4fc3e1691bcd3c8dc82d1f05457f8639f807ee233958a
156 Risk Score

Malware Insights

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

The file was detected as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of these links and the overall detection profile strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://huntic.ru/uplcv?utm_term=phase+plane+method+in+control+system PDF link annotation
    • https://gw21.ch/uploads/userfiles/file/siduxipa.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/9ef5a087e8bf3c99411836d3bac8bc99/79458521199.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905d262699c---sedufunajugatanoxesik.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/28865450728.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/21254500676.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a34c44e4353---zanuwapodakewor.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/53925492691.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/mosovogeramubixolixejel.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/264eb8558d6af983fdae46e6fe8e8e75/dotuxetatajokido.pdfIn PDF document text
    • http://banquat.com/userfiles/files/dijipasowumugixew.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/68263096885.pdfIn PDF document text
    • http://cocoal.com/uploads/file/19079493202.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/90766397295.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/80826692445.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608138cbd5b40---72619231159.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/62362460882.pdfIn PDF document text
    • http://mcalesterhighschool1960sreunion.com/clients/e/e6/e641a1dc2b4fc8b0483efb779338bfbd/File/13842685906.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/73132690706.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/desoduzi.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/belizanubisolafudatade.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210730005110_0da2cl.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/40850862672.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/08e30677976db089adad32cc6f7a52df/45658265955.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160759c11c576d---48441604295.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_off0000dfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC2 10896 bytes
SHA-256: 8976c78ba4fd553b837c44646087e97e26f37eabc1245c49f16eab51c62b7216
font_01_sfnt_off0000f8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C3 16464 bytes
SHA-256: 15d6d30925a043cce9dd4e053dbc79279c3faef03fd232b43cf457c38ffb6fa1
font_02_sfnt_off00012345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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