Malicious PDF — malware analysis report

Static analysis result for SHA-256 da44e0e9b30a63b8…

MALICIOUS

PDF

94.4 KB Created: 2021-07-18 08:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8ec03bc4fc0598c23b3cc6dc4c85afca SHA-1: 5787d13d3ae90bb4a85f276fddf83425f1a5d2e9 SHA-256: da44e0e9b30a63b8a5c4cb6c92c543f83a8055337a83642b6638d7aa57ae5d33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to other PDFs hosted on compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and embedded URLs point towards a tactic of using compromised legitimate sites to host further malicious stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160737653e8888---nubuduwu.pdf In PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/d9pjf6cqt2iacebdookcc8b0fl/gusosojufesi.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/devitod.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/37995579501.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160984b77749e7---160647167.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/lanaxokitawu.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/2035235623.pdfIn PDF document text
    • http://hevolta.com/upload/file/lofonepusam.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/fb3ku4ufu6t33kjaqr6pc59e0k/38148832832.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90dc9d9509---gafipuluze.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/3885276163.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de2d8ce90f---86687680226.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/wulijuge.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/900a9270266feca4bc78c1e860201495/lifuwamuxu.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/sasobikixalijuwovuto.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb37c68327---sirutatavixe.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/5esc015u5mehark85rll5kq3am/wadabitijuboxovamezuv.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/fubudupumurexumoz.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210613053850626.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210529_194510.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec0c0c146c---tasuxuxuvijezasekusisoru.pdfIn PDF document text
    • http://industra.sk/userfiles/file/ludowisobitizidijamidired.pdfIn PDF document text
    • http://tulga.ru/editor/files/tiporanusafovufubupopu.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/26d985c191fdde6b56c9af5ee81656f5/mutukujujininidegepawet.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/121d2961038e26ee6664c2894d269ca0/sivelaretinubijaxinef.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee163ea6f---mokus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+laws+of+the+spirit+world+read+onlinePDF 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_off00010bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 18136 bytes
SHA-256: d68e91a182ee1d063798d03cf452282864e3a998ae754049dd24e66bf3711e12
font_01_sfnt_off00013b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B44 10644 bytes
SHA-256: f6edb475f5ba54e9f1068926ae3c8579f1283f5afeaca3569cd40c6dc9661ef9
font_02_sfnt_off000153af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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