Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f3bc4f95cc98df…

MALICIOUS

PDF

89.0 KB Created: 2021-09-02 07:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae13a78e0ef7e54561d12c3be9c28eee SHA-1: 3ce2f218b7f994c6c866dde02c9d552286511563 SHA-256: a4f3bc4f95cc98df928dbcb8cfa4d804181f609efb7466bb8d74b7b8d3e57b82
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript and the nature of the URLs strongly suggest an attempt to exploit users, likely for phishing or to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608875bdf0245---rilafireliwamovemutage.pdf In PDF document text
    • https://szallas-karpatalja.com/upload/81420736323.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/pudukijetetu.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc805dc3e---vilisuzamenuvebaf.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/547885ebb9381914adfddc01a2a2bd98/77523921257.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/12736096104.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/80463152746.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/97783312071.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88311c2a4b---fubowezopebepebawi.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082f7c833805---22112270335.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/liq059ck5e6ks8tgqoub53c6da/7797773420.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/72602555578.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/20093880262.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b103cc69ba4---26680224129.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/webagazadevu.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe2da2575e---zotezusem.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/76854173378.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/zeluvisuk.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/9306763619.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/37373338656.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a33a20f7ac---rutopuge.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/83294624578.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/wexuzo.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/ab051f4436324d4b0849f0a273c9287f/53118784136.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/7f83ec30ba6020562ac8dd8d4bb33139/titutafet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=what+is+a+combination+of+substances+that+are+combined+physically+but+not+chemicallyPDF 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_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 18028 bytes
SHA-256: 960f85e977badaaf97331b047cad4ce64564cfbb25cff3e5e2c8df71495161d1
font_01_sfnt_off00012276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8D 11232 bytes
SHA-256: a040ce0e806b7760388daed41198110873de9030185a53ba6e352ccf6630ca60

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