Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2b4934ddbb975b…

MALICIOUS

PDF

74.1 KB Created: 2021-09-09 18:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2d175ef239369913d2bd9b077cba130 SHA-1: 8a504d00cbca0698dfa8d0555303e0e8a6c82ee5 SHA-256: ae2b4934ddbb975bfd16d3cb2743864693889a5ef2e09e6916b52555d5f87299
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external PDF files, many of which are hosted on disposable domains or compromised CMS uploads. This suggests a tactic to distribute further malicious content or engage in phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=yes+2004+full+movie PDF link annotation
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/82444243072.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/54044266717.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/90316547928.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/jumug.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/68156841367.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/22837143619.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613348f5cf605---7487034101.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/93907712313.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/banera.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/99597305842.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/92421064535.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d07a4f969---57571312324.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/korudagalifarojedituru.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/renusulud.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/nobivesozaxajarufunujavux.pdfIn PDF document text
    • https://activepymes.com/pub/file/5729015217.pdfIn PDF document text
    • http://kasargod.net/uploads/file/fepoferezorif.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/45902496078.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/wikanetobadi.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/43315144835.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/penaxunabololugedalaseval.pdfIn PDF document text
    • https://kaparatt.com/images/File/tedijati.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/58493800180.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/15994446846.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/8c87fac41e45758350d3ddb7d561db5d/nazesaju.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_off0000b92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92E 10380 bytes
SHA-256: cb1815ed0d2cef5a4354b768f136c978ca066155649e2766eb578f87f49e796f
font_01_sfnt_off0000d0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 19376 bytes
SHA-256: d0d8b31c55be8b06d0d370f8f619235b7b2a85b8351df54b8df5d45853364081

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