Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94f6a94103e139f…

MALICIOUS

PDF

87.5 KB Created: 2021-07-27 01:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8c5c9c9d641fee867ea4d9d4650121d9 SHA-1: 5cd1d38d2cc49228c5e589c8f6f0467eed243de4 SHA-256: f94f6a94103e139f41bb73eb46a557e094f266fa71cb7115471300f53ba5ad62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious document used for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.aportecnica.com/imagenes/editor/file/visokapusalelut.pdf In PDF document text
    • https://www.alapan.org/fckimages/file/81421608260.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/9496956888.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/14263601868.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/0a2c8857fe87fad74492b58c46e433b9/tidepelawakejemuvux.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef9d80ceb8---426592966.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e814c63fd---80979108030.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/wuxuxawamegiso.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/rufenisoderuki.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607622efc0f49---42118189113.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/kukefidujibulo.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d30623380a---68654288360.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/52275717400.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/uj2f6unsluv35tln1fjbda61u0/70905226464.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/vosivajavoki.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac68e91e0c---76045498974.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/5ecrim9vsgcqf1tmrp81k2lrs6/94721740168.pdfIn PDF document text
    • https://kuepancong.com/contents//files/15844706745.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/37807741252.pdfIn PDF document text
    • https://actor-conseil.com/files/file/40928278418.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/komopotubefobodux.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/sevalazi.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/c141daf41e8125e2dc6d04f3b487d17e/mofebemeromaxumedet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ejercicios+de+agilidad+mental+para+ni%C3%B1os+pdfPDF 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_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 18124 bytes
SHA-256: 6d938b073346c906fbbbc893f979a240ac4a2a07ac785034d7d448e8f0aca1b3
font_01_sfnt_off00011bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 11284 bytes
SHA-256: 130ef7123c2822a82c9001e501a3dcc4e94e0426143ad914c27bd7564e483b46
font_02_sfnt_off000135c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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