Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38c7f8ec93da458…

MALICIOUS

PDF

76.6 KB Created: 2021-09-01 22:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1d9c71b665624d00b14f22d94ba5722 SHA-1: 765fa68c13162ec80ff9d248bb8795af6888394e SHA-256: c38c7f8ec93da458c0d69deaa857dc3d41f96358a61a64b083f300e23e6fe580
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites or phishing pages. The presence of multiple links on disposable hosting and compromised CMS uploads further supports this phishing and malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chcial.ru/uplcv?utm_term=police+exam+question+paper PDF link annotation
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/19d3c9e56d5286445644262d507051dd/82464301207.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/3pp78sb36jq4mv3d9csjtt2qo5/32407234478.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d6b2d00ce---80793481277.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/60047272465.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/5601029055.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6e7310ff8---senaraledepuzoj.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/babemozorobur.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/28512287208.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9281031b3---pasokesojemiwira.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/pejigudazarek.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38d1865771---21411141036.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/24181868663.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/f1lg67gobglh1i3kiulplt62u0/xixexerujudurogu.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/kiwozixekowujam.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/37e6cc2d63f7d6cd8d615461a0716423/96307486400.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/62158860679.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21ae3ced5---81780293524.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/8cf5dd7b8e852ad9e1c89e1e461239ef/kiposowobazaruserikelajes.pdfIn PDF document text
    • http://baove24h.org/upload/files/jifonaviloniwikusoxok.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/60032575516.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/69223250317.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/mukaligubad.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/b789hled86hmpn76mkkcfag840/41912334977.pdfIn PDF document text
    • http://www.bash.cl/media/file/neperatiduvavopazodelomuf.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD323 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000db20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB20 10884 bytes
SHA-256: 43961e268100d5673f8b66164083630d9a70728f0cb35e1e6ab213250803611c
font_03_sfnt_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 18640 bytes
SHA-256: 30856bbde96ea8bfadf96c9b4472a9858e530e33da4f75c3c66ea56cc1f29b4a

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