Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c5e528ec5dcd60…

MALICIOUS

PDF

79.2 KB Created: 2021-09-04 11:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ebf0f7b2bc49a74bf2527ba7f76d5fc8 SHA-1: e812bd6f3fdfa55e803ad8c631b4b04752f9a569 SHA-256: e6c5e528ec5dcd60e2c029da873aa8052b0eef5f5e7b6aa112f6e6f180b7bcf2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://neboskreb-irk.ru/uploads/userfiles/files/88114845659.pdf In PDF document text
    • https://aartipalette.com/userfiles/file/61761036430.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/71c2a907b700be669651b7668c9bb569/30807112037.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2e984d4c0---vapet.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/kebawezup.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/31327786593.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/bipilijexun.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/nodoronuvitoxapelexo.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/lenefo.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/3lvuc8epi1k520rqmedjb9mds8/6640023872.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/18164763442.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/jerabokisiwireloje.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/51224034842.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/e05dbb08643156e0627a5b6dbb2b9fc0/jarebesu.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/votuwakebes.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6132d5ed10e05d0d0101349a802440a6/jupoforesodosuxafoj.pdfIn PDF document text
    • http://e-district.org/userfiles/file/zuzoziratepez.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089a87c7cd85---toxevebip.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3acd01e2c---80235689597.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/fadixarol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pariksha+manthan+geography+book+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_off0000c53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD51 20764 bytes
SHA-256: 770a2243a6325ba80029dc436b3f9db7724a21d0d6c4b8a475c15975353ac2be
font_02_sfnt_off0001140f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140F 11248 bytes
SHA-256: 6c12195ae951f71e213c94b7bb32e1cddd4c6d89de30c4742d618dba6332150c

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