Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7812ded294b928d…

MALICIOUS

PDF

75.6 KB Created: 2021-09-24 06:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9796e1f020713f7da097954e98b7c65c SHA-1: 80a53f078760aea1f4fa041b58d30392f6e1d970 SHA-256: c7812ded294b928dc74fab1440d72652674992444fd0b38e15726e35daba2428
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, including compromised CMS upload storage, suggesting an attempt to obscure the final destination and evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://hizlipin.com/calisma2/files/uploads/budizaf.pdf In PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/votivirufola.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/bipurobupexemidogukure.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/dsrelmj1tb7c63mr9s4hn3dhu5/1927842882.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/xanipe.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/jemuxowemoj.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/50565965469.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/jufomadiputar.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/58930257222.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161400a4b399d3---45615575915.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/tumozesaxazarisilebe.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/30707711808.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/lizoledarivimula.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/64919516821.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/banisumetogegomujevefak.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/56817033064.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/51467407429.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/zevibemukot.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/lagizon.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16146f5b2ee130---94542936922.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16143bdee66ef7---kenaxobijifawuwoxe.pdfIn PDF document text
    • http://surtek.biz/image/files/20150406_013149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=harry+potter+quidditch+gryffindor+teamPDF 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_off0000c318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC318 17256 bytes
SHA-256: 6649746fcc8d59150cd484c8e9f6c79f8c3b5abe2ac1973d1a68ec4d067b86f5
font_01_sfnt_off0000ef78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001078f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 11204 bytes
SHA-256: 2dc7866b707a18bbd92cca5cb181a10439f3b74f6bc978b0cf12b5799af591ac

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