Malicious PDF — malware analysis report

Static analysis result for SHA-256 423da984191a4b26…

MALICIOUS

PDF

77.4 KB Created: 2021-09-19 10:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d2b2c62ebed33e10e01425ed9c7e5a4 SHA-1: 3a12bed28c7bf69dc58c4956422eb1487d2529fe SHA-256: 423da984191a4b2675837b23cce5ac2dcaadedf32eb3ad7d9e18b47f7c1e2872
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=last+day+on+earth+pc+mod PDF link annotation
    • http://densayhongngoai.com/uploads/userfiles/file/tajulabinozuja.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/najaruz.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/4d0d2804e30fc66903cdd5e8a2b62305/nujifegew.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/95000215705.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/80700766673.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/niborivalavenanasig.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/tapedozagul.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/wizerobosivenix.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/68330605379.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/92921626351.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613b433fefd3d---78736166064.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/765e9aff247b21e6787d83b128f725bd/juxuki.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/xubibupugenerovidu.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/zixexasowana.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/tobiwalojezotagida.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/duritolujis.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/tubobivirabowo.pdfIn PDF document text
    • http://amirmazandaranihospital.com/ckeditor/files/files/winadedaxotalidi.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109162256581330.pdfIn PDF document text
    • https://hssanesteban.cl/files/xedikevadofudimux.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a971dd2a17---sebopixegilewoxuk.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/f1852a99be96e75a37444358194af33c/rinawalideto.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/tajedananis.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/97114307956.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_off0000cbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCE 10712 bytes
SHA-256: 22cde603fc92cba2a9a2c00211225cf8aa39bfa2424726b12cc3e36695d2f0b4
font_01_sfnt_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 16772 bytes
SHA-256: eca149874f0c6708497d930619c7b73fca728d2d9dd79a6fc4341a4e40bfe9ee
font_02_sfnt_off00010f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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