Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e5dfdce8b034ab…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 23:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 40c9932b62de8376bbc501f81b62bb7c SHA-1: 9d697f9f7d933a7828c9b6fa32f295263307296b SHA-256: 45e5dfdce8b034abd1b0626ca0addacaf80512d3be2c38b063c278ce4df156d5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The presence of these links suggests an attempt to lure victims to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=how+to+make+ir+transmitter+for+android+phone PDF link annotation
    • https://atlastoursntravels.com/userfiles/file/79277075734.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/pituzabot.pdfIn PDF document text
    • http://cartopack.com/Images/file/wovobemaxan.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/50438210687.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/70456716372.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rakumeboxatadunum.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/latirimavamaperezuko.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/92721967107.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/41525510626.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/dirizuxozasiwamozim.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3e5896551---51071373478.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210920095331.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/lutomitidupe.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/89306089632.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613579104bf9f---vafowogos.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/rowovoleluzatiforo.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/fepepejo.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/95070523074.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355a0e86da4---41867940667.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/wifudowalipoguke.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16139e6716a77f---29869904214.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/40d258ee54f2a0a7cf10a78a68df4bbf/lufikaponapesebigimizen.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/pivakasa.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_off0000b2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABB 10888 bytes
SHA-256: 4979fddbd9dc145cb163bfb38325ea4cc13f7e23b7b169a343ec05256fb0dade
font_02_sfnt_off0000e3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B4 14564 bytes
SHA-256: 1287aeadf0ff3fddaf738cce65b805602da666f020db04ebf123c00846bcade0

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