Malicious PDF — malware analysis report

Static analysis result for SHA-256 6844f3897e0aa636…

MALICIOUS

PDF

92.7 KB Created: 2021-07-19 14:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aa776d4ba959b22dc83378c29ec07f63 SHA-1: 456fc392e7a4a37751fffde40bb6fbcced54cf30 SHA-256: 6844f3897e0aa636203cf0e40217222d70e72b4f7f69a9313702ea7c5657f868
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which are hosted on compromised WordPress sites, suggests the PDF is designed to redirect users to malicious content. The embedded JavaScript likely facilitates this redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2105051734056930562n23sn.pdf In PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c75b0e0348---xafewidimusorakutimif.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/f38fe0ffd75d3e3c8672c7a98f8f9945/papupenukulusijalesase.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad2569a816---lopevodetuk.pdfIn PDF document text
    • http://caramelitos.sk/files/84599078400.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/nojukelaguzutubeb.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ebb34edada27af73c8fed1f6e03b8b36/gavib.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/b0vfoa6uhpskslm3ri7fqr7tl1/7067499944.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c67c5f375---rogasezururaw.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/vabowilaxevulopebunan.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab207262616---lemek.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a527bf5edf6---74254133455.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/15136833228.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763ad46037f---95928953051.pdfIn PDF document text
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/zuwalinosesi.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/43030842061.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/89960081952.pdfIn PDF document text
    • https://anfauglir.com/images/file/68344146036.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e78e789e06---36966950274.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3d4d6f133b---69950558048.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608a422c43990---wexobalazotinaleg.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b212f1d2d86---kupeguwanupevikosobobut.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/3cfd214f09e2091da31c077ec470a979/fubolezesenifepesidoto.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/68711315445.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/xiwoviboputoribasabewite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+the+difference+between+single+displacement+and+double+displacementPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 17152 bytes
SHA-256: 872c53e50ae4581ab4f21c030fd0a7aaf2761a3fc3b05f6e496ec78a40a2c602
font_01_sfnt_off00011c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C52 11388 bytes
SHA-256: 25a42121daed8bd70ca203ced6bb7674916907ca2a549bbe6bb1d3e1a9e1b1d6
font_02_sfnt_off00013692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13692 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_03_sfnt_off00014c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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