Malicious PDF — malware analysis report

Static analysis result for SHA-256 c288888f4e98685a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 19:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 134c3fe0036577fbf334a1ce3c57b9ae SHA-1: 4fba18ecc00f5945748219303d78598b0d9d3293 SHA-256: c288888f4e98685afc183fc0af0459f982ee3e4548190423389435cb0783f326
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=gunlord+neo+geo+rom+download PDF link annotation
    • http://eclickapps.in/userfiles/files/76395016702.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/gegomogixagugenufiduv.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/zigexabom.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/bamuvufebamuwubi.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613def111548e---xuzopazotefigadoranalene.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/sewanodukoronun.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/45065454524.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/zujumetag.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395c272d351---fatarodosejutaxes.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/43eb015f39d97f235ce4923e66181b96/91763945011.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/18564830746.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161359a13639cd---jedubogaluzujaxog.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/sudidogogevasekolem.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/66455523926.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/51429013639.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/57458786568.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/52647233672.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/lunazugimemejokugelitutim.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/26113513116.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/2712176833.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/1192603379.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/sosatinenikobedumon.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_off0000d6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A2 18804 bytes
SHA-256: 14d39c0ad577a217a1824b98f110e06ba1ec784a16798b59dc1b97d5a341d6c6
font_01_sfnt_off000107a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A6 10460 bytes
SHA-256: 6f82e0a6b10c401acba0b6a992e07f6f2182d7906f7c4b79e707e16c5c7dde36
font_02_sfnt_off00011f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1