Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c29dae6b3e3f0b9…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 00:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 743d44388921fb0fce169e2bd6e5b704 SHA-1: f43de799a044e48fa1ef1a4c86aa2c57065974a7 SHA-256: 5c29dae6b3e3f0b9aef6116da562fa0d9280ba73ce5d0e50626b8e2e1c47f8d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are often used for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ketchas.ru/uplcv?utm_term=chord+progression+master+pro+apk PDF link annotation
    • http://wxhsbl.com/ckfinder/userfiles/files/20210906_084411.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/6783332592.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/mowuwob.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/44116910960.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614110035e798---15800101481.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/paremamepebikeb.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/5418348031.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef45e0ae2c---fopufo.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/filovoferimediwimafapola.pdfIn PDF document text
    • http://fructusartis.com/i/File/76624515740.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/sozizurojabumimoti.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d4a3deae8---fopodupuxoxejadonezoru.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/85516251444.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/negumusudovofilumaso.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/kilujajiralebukal.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/98222039884.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/e1jjgnr00urhgafapcq2cmjgrs/51697818434.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/lozizujegixiko.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f1dbfa326a459c740b03b9432cc9d26f/54512424240.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/demedepawuxit.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/vavunipixapa.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/62117c38cb2b76dac7b3f809ae6e138f/23737467436.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/wasetinetegizadinufuto.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/52423900093.pdfIn PDF document text
    • https://unitjaya.com/contents/files/rajadefebimagimixajebut.pdfIn PDF document text
    • http://tercovci.cz/files/file/35177254209.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_off0000da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 17324 bytes
SHA-256: c5d7aa6d2787d87c56e4d28eba1217e5207c604095caba662376daeeb7457d47
font_01_sfnt_off00010791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA8 10916 bytes
SHA-256: 78ecf497893bb25733408a7fccb6ac0f55cfe9773cdae311be2d41f52be9c1a8

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