Malicious PDF — malware analysis report

Static analysis result for SHA-256 179b4fb2a3aa4171…

MALICIOUS

PDF

96.7 KB Created: 2021-09-04 20:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4fe8a8dfca5eb84c1191a1a15c52ae75 SHA-1: 3feaec9962c027ffd1f496edd7de2767a204a2bb SHA-256: 179b4fb2a3aa41716654caab48b1774d7c64fb98205fb42925602ad6efd355f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on compromised or disposable domains, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is a phishing or malware distribution tool. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://infrive.ru/uplcv?utm_term=peppa+pig+script+pdf PDF link annotation
    • http://areaengineeringsrl.eu/userfiles/files/labizubulotizumumude.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/33200231254.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3e8843407---20415038251.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/78962653061.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed09c61f95---zizolobomapegukuvet.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6a07ba30e---xisakuxomajetelu.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ed73c1ea500c531311f44f1737ac8a29/pogujasobosusokagafataka.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1a8698848b95bbc3d9903a046cdfa4eb/50181903789.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/zerenebozekeregezalu.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/12558470041.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/6441175764.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/zoxanipimuvejunez.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/21142394058.pdfIn PDF document text
    • https://aedwea.com/upload/foto/lofipumidebagepig.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc1a9be01a---sikekesu.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c1ed1ac5f---34329495652.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/5ple36p90snetm32476dj6l0l5/mekifen.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/61519694371.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/15da8bb4cb7c51cc87775cffe90ae4b0/lizujibig.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/46269457108.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607db72f89f79---7749960875.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/luloruvafa.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/sqe78mgq0cu5dimudeau6nh6co/76708680066.pdfIn PDF document text
    • 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_off00011891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11891 10528 bytes
SHA-256: deb6314e279e8011e844fd90624fa21a7631c640c214ea27aa80f69b4c9f6781
font_01_sfnt_off0001307b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001488d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1488D 17568 bytes
SHA-256: c8ead362b9394d9014c03645aa058a0d1c82531c6f7b3cbab14e63e7da48fabc

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