Malicious PDF — malware analysis report

Static analysis result for SHA-256 2913645e502b8cdc…

MALICIOUS

PDF

86.5 KB Created: 2021-07-19 09:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 4575d327819012d3c0069f86f9b9585a SHA-1: 60451eb2d99d1d871d0c644f5b7c9403dee4b3dd SHA-256: 2913645e502b8cdcb7944d8505b05d80aa550348974176dfc56d925269ba023e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document is designed to trick users into installing malicious browser extensions or updates. The presence of numerous URLs, many hosted on compromised CMS upload storage, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/9f9ok8j05iod8u2bqkbnt91pqt/76100461513.pdf In PDF document text
    • http://kasargod.net/uploads/file/jumasexod.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/filabupo.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/2717007199.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/bojeluxilagu.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeb0a344c3---jorifepalipilenuwawi.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/gilefaw.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/vubogifo.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/52ef338c5e663403c61c73946a7a09cb/61790604750.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160706a8163bf0---54298289147.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/623b276953018144b09badf141bc7d56/wirimevawagosekovip.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/wubinufuwu.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/85943361153.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/7b36a20f125022699cd30bee8bac6f37/41391288704.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/5237o8hcd40qo9d950a14eqoi6/juzojobetavonefowituku.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/46108711007.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/74e8a3a28bfcdbf828177bb8343d6dcf/85024695991.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/56915090460ab2a9a89ca3.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4d1724d75---81700155796.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e2348e040---xepogo.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210526_182351.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/8806h17u0o2a2gpla5lq89488t/pusujepepobirufomixas.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/057ba734e52e84be19516d9f5f23ca7b/13585643954.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc8ca5df8---81858714515.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/sovurelibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=online+combine+pdf+files+into+onePDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/bafozerugutulevukawubitu.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_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 10684 bytes
SHA-256: 15a08cc5c7dd54258d543bd7b7a91216b1cad56e7ffc1f2ff87820d5efac913b
font_01_sfnt_off000107af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 17096 bytes
SHA-256: 160c1a7e15d8ab9292a0a7631927789a89644f402357b8b327e9a7046552de82
font_02_sfnt_off00013480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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