Malicious PDF — malware analysis report

Static analysis result for SHA-256 29e421110e5443d5…

MALICIOUS

PDF

78.0 KB Created: 2021-09-13 11:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 15251d217691ba3b943e207d09d08a6c SHA-1: b2f85ed342b085a1c656e41158ea6f71fb12e106 SHA-256: 29e421110e5443d59c43c585cfc1dfd095a70ff0f2ebf5c581ead78860fc93d8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an attempt to distribute malicious content or phish users through a network of redirecting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://ranch.pl/files/file/punosadonuzepis.pdf In PDF document text
    • http://bienbao.net/uploads/files/35179804061.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/57754807887.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ighkfp7f2pjr9p0odp65dkt110/53987566363.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/39032961183.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/17929539019.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/6f181aec8be688492044b6e207822470/75029769864.pdfIn PDF document text
    • http://ergakiland.ru/files/files/gomexonuviluw.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb177adea1---41995260859.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/lolodekoxanaregi.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/sopixukiti.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/gejarotibozaduwuxul.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/49960703434.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/56903805376.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/34296571148.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/peput.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/vivikekuvosusefapamuzuv.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/puboze.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210913_78D7F04AF5ABF895.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/vumidisowudab.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369ae1a9334---64491613078.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/bipanaxajisi.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613001d816d9e---busulubeb.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da32a73f5e---xedemerokamegaxomoxeze.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/vafugukusovaxekoraxusebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=atomic+radius+of+antimonyPDF 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_off0000cbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDB 17844 bytes
SHA-256: 979a20ac30b18a1291b4c13efece4e20295fb3c5186c2fe70f50a337cee405c5
font_01_sfnt_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001124c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124C 10656 bytes
SHA-256: bafdcdea85f6b0815b11f39c994dc7d3e61d8d92e0963dd1dd520fbc4f13dc1c

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