Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfcb1b8d90add756…

MALICIOUS

PDF

82.6 KB Created: 2021-09-10 18:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a7c403fecf0a4c9879f984f7a95b72e7 SHA-1: dd2c9490e55e38d3fc84e97c952bdaf732a66479 SHA-256: cfcb1b8d90add75648979290e51a965eae0f387b5d11e57b14f554b7335a35ba
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cristalensi.com/public/File/40876040505.pdf In PDF document text
    • https://preprodpcb.com/userfiles/files/38308065401.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134075191f66---boxupakopi.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/24958010360.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/26819230567.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/99351515494.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/68193158214.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/fuvokiduzeziferanu.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/2kiqrcpd31u0mro6og4rckf5iq/46239929477.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/82146755747.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/vofabide.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/forotusuwevuxegaf.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/kazixunuwidemanoludubom.pdfIn PDF document text
    • http://a-pluset.com/userfiles/48989172409.pdfIn PDF document text
    • http://ktcz.eu/files/files/64138231752.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/78309395038.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/99437113389.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/pikenijalivoxududuwopiwed.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/zivokosewuvojemibezisa.pdfIn PDF document text
    • http://retailcop.ca/files/wogoxokutunanuwevevev.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/mosetinulonutilarepokuti.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/24142768772.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b579628bd2---75607417096.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/88141643048.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/kovuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=miss+peregrine%27s+library+of+souls+free+pdfPDF 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_off0000da8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 10956 bytes
SHA-256: 7813b4e82e0cdbb1e029d3477dbd47d4f5fd5c33737211780849a34547bf1644
font_02_sfnt_off00010bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC4 18852 bytes
SHA-256: 19de71efd548d2fd272436e58f4ca4a7c8bc0dc45b911152454064e8f962e0f8

Open this report in the interactive analyzer, or submit your own file for analysis.