Malicious PDF — malware analysis report

Static analysis result for SHA-256 315283865368b3d5…

MALICIOUS

PDF

86.4 KB Created: 2021-09-17 06:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e3851a6cdc4cab78b561abdf090c5118 SHA-1: df16a09a74111a7d0ec3879610205e63e6da5d4b SHA-256: 315283865368b3d5059d22063cdd92870d39e5c2ba7f213ef81746b9d00502f4
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with several URLs pointing to compromised WordPress uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns suggest a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wastran.ru/uplcv?utm_term=gry+karciane+na+androida PDF link annotation
    • http://sarkar.ie/userfiles/file/kogudoxorexof.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210914160335.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/xerezi.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/23293674280.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/dazowug.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/9e1e23e9fba227cbd5d3e18a6f19a179/37132568245.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/85325768022.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/noxogojipopizijubuk.pdfIn PDF document text
    • https://kvzriu.org/images/file/9591946718.pdfIn PDF document text
    • http://billsky.ee/files/file/korisefelixezuf.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa0649ff4e---soxodolusezezanawonawisij.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/wasogiwodalalagikerenewi.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/64375015546.pdfIn PDF document text
    • https://csodamalom.hu/files/files/84983469840.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/11809503803.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/53846714915.pdfIn PDF document text
    • https://motoralbini.it/files/file/57643632629.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/52621732693.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/vovolavup.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/febitirabuwirukodozik.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16133f8e164a09---17608668662.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/92346179639.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/a5ef1a5b045d8e39774e23d93228f4dc/mufisupexa.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fabf1bb2a5---98875487242.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_off0000ee38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 10296 bytes
SHA-256: 1837a73ed796adf88721cace3e9cf16020869ed9514ec493436d6067bf2c5350
font_01_sfnt_off0001058b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9D 18608 bytes
SHA-256: bda5cbbdcded176dee2ed5bf212b8f70b95d89354eec23d46400c8158cc5236d

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