Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c7c8037a255001…

MALICIOUS

PDF

78.4 KB Created: 2021-09-04 20:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eb46905d5343b87e5e01ea802e4945fb SHA-1: 380e439b536237c82479f70134b651c5ffa9fa5a SHA-256: 17c7c8037a255001351a5f9c83c153f9e461a9a84737da7d574fc1b290e9cd43
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/555a53f3575d4e865d4e464a90f26d68/87798072294.pdf In PDF document text
    • http://annamsaigonlaw.com/upload/files/17271073341.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/684e4cdea7a01e0de4df2702785e717b/fovazalagapozipobas.pdfIn PDF document text
    • http://gewald.ru/content/Files/15923338985.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/13868313124.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/21540921439.pdfIn PDF document text
    • http://uamarkets.com/images/file/36844785314.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/86937378659.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/25325681747.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/c2e1bf3ddb4148b96a976263d0e92abe/81431292656.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210903071706_7jf3rg.pdfIn PDF document text
    • https://krossi.ru/images/content/files/xixadeseperojabeluvilogu.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/maderivigivafozelamol.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/6dc350fd1d3f859d82093f1051147808/7744021153.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/81804423889.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c8acdb52568---75976784742.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/19971075579.pdfIn PDF document text
    • https://topupdana.com/contents//files/gokoxuxokofodabiwag.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/650b220ef71eb681e09245b3b3c4bd33/54581855143.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/xidusafedivatosamuboz.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/jimubufej.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de5ea687f0---65936202411.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5217491b8---96145118406.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/00f8e1737b3a94c7da2c2ff26d0adeaf/faxujegirodudatiwepesupef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=x+and+y+intercepts+graphing+worksheetPDF 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_off0000ccab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C2 11044 bytes
SHA-256: 68913ca8a0f4a20c77b6967463cc0a8aeccb1b05b39766b12c1810e1f3a0e420
font_02_sfnt_off0000fe44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 17504 bytes
SHA-256: ad730ddb41ede3753879286ceb255b2f9630a9d1bf952c7a12ebe5201b76d50a