Malicious PDF — malware analysis report

Static analysis result for SHA-256 49059fdc70ca72f3…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 10:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4793e92a66b056924271efd16a7841b4 SHA-1: b733ffe5509c911ea0f541672af405d192c4cf8d SHA-256: 49059fdc70ca72f386311277e5c95d39c25de390728744e88af28abb42f2caa3
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. Several heuristics indicate the presence of link farms and compromised CMS uploads, suggesting an attempt to host or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://carbontuning.ru/file/joduxojiveku.pdf In PDF document text
    • http://elitsatodorova.com/uploadfiles/file/18485493506.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/37075555014.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/tarobatujewimuneral.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f98573071312565c094d108bce2796b3/wedokevavijak.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/77442665722.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f8d1b0d0---22514302761.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/i3dvanub9an3qu3fs84flh4pv0/49502971130.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0900464cc1a4b624df66bb34194dd312/detopuputerufejukonep.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/samizusijimejarozore.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mokipebu.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/pazosilinufupikevetip.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/gokozikixu.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/70639725517.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613432c6d3d81---kufimanepo.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/91145609518.pdfIn PDF document text
    • http://someteme.com/archivos/_20210909214847.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/nuxaxowobape.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132f2533e642---17799929379.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/632640806613af6b5c1078.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/60621328310.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dbec2df15---4734396196.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/45195545962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=house+at+pooh+corner+pdfPDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/57638404169.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_off0000d874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD874 10672 bytes
SHA-256: cbc4a620d4b31bd4e0dea6c071aee0b6bfdf15ef2081c91e8994768cc330c2ef
font_01_sfnt_off0000f0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 17768 bytes
SHA-256: 83f4f04ba4382f441e39d44125cef040c90c4915314b078fe42650f88d847e31
font_02_sfnt_off00011e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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