Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f5a88d8aaf8dc6…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 17:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1ed9194d05c1a3629c9f3d3c45638d79 SHA-1: f95b221cefe2af167324230036f04f23d8255d1e SHA-256: 90f5a88d8aaf8dc60bf77a99e0946211dc39cfb536fc2d4197e870066f16ec4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is structured as a link farm, with several pointing to compromised WordPress upload directories. The presence of these links suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=passe+compose+negation+exercices+pdf PDF link annotation
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16072eba86e3c4---88183211675.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/zavewopu.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/23605668286.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/rinogefibevam.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/27265578069.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/salozuro.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/33174912705.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/tikelar.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/ruzewufupezaxik.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0545e18d0---nemijeme.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e10658bf70---95566593905.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/97630078409.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/12041408750.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076cbaedf5c6---funuwa.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd248f32e---puzifunofe.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/2f5acd848cadafbb0d01c84851e5ede3/13179270164.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/bupowunuvagox.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bae24ded13---12527533816.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbdc86b3e88---soxoxulibuzuwiduxetuseful.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/v1232qoq22j4j6lfsapjosh8th/dunoxakuro.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/13917213720.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/06508f446483061fb74f1d2701821e9c/vunukadab.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/bk47e0rh6fae0mact8c7chvu7l/49578176649.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_off0000d369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD369 18936 bytes
SHA-256: 4e45bfd433484edc0378d54f59e373a83ec11233eba2b02569d7f5fe9296b6e2
font_01_sfnt_off0001049d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049D 11020 bytes
SHA-256: 48a73623df5cc112fa39affc67f4bf6747ebfb7af4988f31634023bbfe7448e3
font_02_sfnt_off00011e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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