Malicious PDF — malware analysis report

Static analysis result for SHA-256 95bd2bd1d725d034…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 11:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd2b14af138af797c6c11bbc7954c5b5 SHA-1: 721542f25d9091f5497902aa352efc53f25ff9ff SHA-256: 95bd2bd1d725d034aae9880264ac4631d873a69582843516fd7f2f252a48b183
164 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and numerous external URIs, many of which are identified as link farms pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript and the nature of the URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://cructi.ru/uplcv?utm_term=mega+shows+movie+app PDF link annotation
    • https://selispin.com/calisma2/files/uploads/buzijigebudanilut.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/98756714715.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/63304327368.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/loxovivudito.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/dipagizijusalefadaxegu.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1630751750a5928cb1c1ac064e9137.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/2012410390.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/11916980030.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399570dcbf6---38357265431.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/xovirinidapoxi.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/84164380145.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/fewutumezujuvepatezakujet.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/jimuvivuravajatimed.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161304fcfeba0c---wikeb.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/97708862550.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/sitofepeb.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/nejeti.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130412d40bcd---xetijoxupo.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/fudalu.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/54795620023.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/33553211541.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/wefawuzosododimib.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_off0000d77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77B 18912 bytes
SHA-256: 61c614c1d90f87a46e661ebdeb94cdc3afdcfcdb373305bceef3d225ef04d5ca
font_01_sfnt_off0001080a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12021 10496 bytes
SHA-256: 0e18454e77e4b115e23025d9b5b82280883dc825b0bb2c3705f17d55626819d9

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