Malicious PDF — malware analysis report

Static analysis result for SHA-256 4196fdb083ebbcf9…

MALICIOUS

PDF

87.4 KB Created: 2021-07-26 02:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5340ae63123748d860a1a2cb8a5cba46 SHA-1: 994d73ebb67f0c77eb1cd633a2aecb1cac5b72f6 SHA-256: 4196fdb083ebbcf932e073d3bfe3498d750531c595b33bfd215c379ec69d6052
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories or disposable hosting. This pattern suggests the PDF is used to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://9262895.ru/ckfinder/userfiles/files/40930968893.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/d377c400b3f3eeade93e0652db807db3/5027316542.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfa98ab489---6063602024.pdf
    • https://777mto.org/contents//files/74774671650.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c853f9f1da4---dopujomaraxusilijaxofolo.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/2de7307ee9cfc8047d87ad2440857031/musowoligunapubusobi.pdf
    • https://livres-d-art.com/ckfinder/userfiles/files/66437034909.pdf
    • https://tidymoney.com/ckfinder/userfiles/files/polanamegumazowunoseb.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/p55coa1n0aco93qjhm9f1mi6e8/bupukunatizoxifipeva.pdf
    • http://susasoft.com/upload/userfiles/files/fubererenewujesodulel.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/fk6uva8pc0o4onm6kt9njm8igd/93141442973.pdf
    • http://hdurmuslar.com/images_upload/files/77493160018.pdf
    • http://robalton.es/Albums/images/file///57812815959.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fde1050b504---vuzug.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/5nvou1svh1rp7ukt1pqgpe1861/55242124218.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/pa3o0gnia77902mj4649dnf7s6/30453588802.pdf
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/7826027004.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609838545f0d2---gapabitikafumifogasuto.pdf
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210624_35CE16EFC4ED726F.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/1d9c80293e55d86d9a234c45e01407c0/34405193888.pdf
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/76037760042.pdf
    • http://c2r-auto.com/uploadfiles/file/2021052400140773499.pdf
    • http://gruppocinofilomarsalese.com/userfiles/files/49495801930.pdf
    • http://fairview66.org/clients/866114/File/vezokuriwisekal.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/51987cf46288b838ea39507e03990e12/judezugolovafurul.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=contract+application+letter+sample+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f14c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 16792 bytes
font_01_sfnt_off00010963.bin
e1fd5a27998e66c50cb0afa0dcf059b35e334c295be93cf345adb08bb1f4ac82
pdf-font-stream PDF embedded font (sfnt) at offset 0x10963 10812 bytes
font_02_sfnt_off00012251.bin
ac2f8ca3f8ee6f27ba34c9c99c94f63bf17f51283b286e85ee1e6b480f07b565
pdf-font-stream PDF embedded font (sfnt) at offset 0x12251 17260 bytes