Malicious PDF — malware analysis report

Static analysis result for SHA-256 62479f7a1160da94…

MALICIOUS

PDF

79.8 KB Created: 2021-10-10 04:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 00dd6ce0e44b4a83c5f50085fb5c8da8 SHA-1: 34d4d0e549794d2a682ca718403c9ebb9f30da27 SHA-256: 62479f7a1160da94a4e8b20efa4b95fc4170b8bb4b90b13ae5abdc5bf86103f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns suggest it functions as a link farm to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://oniceh.ru/uplcv?utm_term=liberalisation+in+tamil PDF link annotation
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142b8c76ca14---kiritelasikod.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b0365fea37b788c32419ff759b1915df/bemuwuzanulesa.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210903111139560.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bca669468a---fidesiluxedufosixuw.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/jebufaba.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/20876078722.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/pojenu.pdfIn PDF document text
    • https://vanchuyensahara.com/site/files/55049938973.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/64266842360.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/buxamopojesawoxipumefeb.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/bagemefatuvuxawororofo.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109241212293324.pdfIn PDF document text
    • http://signauction.net/userfiles/file/kivitudelepapolo.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/nofadejuvuravilumupofijov.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/9kgpm9q5ovcpe83p46ttp1gg8g/gofuniruvugus.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/12082028862.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/kevonikawatipasuwejelat.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021092002073780554.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d7f749988a---kidik.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/29849998948.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/vuxilumirewavitiwakuxom.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/12505537083.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_off0000cddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDD 20588 bytes
SHA-256: 0b21d94f9ca0e0ac24dd75ce60bd5da03c74e7409074a4b50ecfc589852731cd
font_01_sfnt_off00010293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10293 10368 bytes
SHA-256: 6e991b663c848597f1d17d9da629eee510a7c2b94918bc59c5e9655dafb139d3
font_02_sfnt_off000119f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1