Malicious PDF — malware analysis report

Static analysis result for SHA-256 04620642458f7ee8…

MALICIOUS

PDF

89.0 KB Created: 2021-09-15 22:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5f5d6c36d279384b701aab510f72b3b2 SHA-1: 7ee9ae2205c374092b408a757707144a5b1f6629 SHA-256: 04620642458f7ee8103ea985ba004af4b431484c33d1ceb6c1fe7a9b7a40c698
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The presence of multiple external URIs and a link farm structure indicates a likely spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9702

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 http://vuoncotichdep.com/upload/files/9442441024.pdf In PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/3563764611.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/59197651953.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/76937171568.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133913e99f95---38309206471.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/25278156733.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/zozikamevem.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/dolavuxodipuzemepaxerokug.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137c7c14ab64---74078894635.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/pikizagaxibipa.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/10224389436.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/nabavabu.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/55285557213.pdfIn PDF document text
    • http://praguetransfer.com/files/file/59789822251.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130683360f04---detuvamemetaled.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5f1191840---86008010823.pdfIn PDF document text
    • http://hydrem.ru/images/file/71714335552.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c27f875c8---47163421960.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210905175117.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/xapafefogenogibaz.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/vadiloba.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/16855173073.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405a64e5003---44477126214.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/27228116271.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/87921790124.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/rapibevabapitesafixiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=clash+of+clans+hack+apk+androidPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF11 22572 bytes
SHA-256: 0df08d0ce9f4362a507a036e4b793ea12c7fc77795cc48537ab91a8b9b032fb9
font_01_sfnt_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off00010f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F13 10612 bytes
SHA-256: b879cdafd2927bd12d783d18fa7e1e9ca6844848234d565f11a95ec376da2e6f
font_03_sfnt_off00012739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12739 16152 bytes
SHA-256: 0f62411f33c11177563efe33ebd0105f37df2a55e6a92cd5aec3f2cc21bf3838
font_04_sfnt_off00013ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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