Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8fc0bfecc3bcf5c…

MALICIOUS

PDF

75.2 KB Created: 2021-09-22 22:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c005d31200c744bae799caa6424e91a0 SHA-1: 1de210421d5335f5380ecace20eac0a754b79131 SHA-256: b8fc0bfecc3bcf5c6c352e39e8b4512ffd7ec60b3617e9b10d59b68849920966
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces the malicious intent of distributing links to potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://crewmak.ru/uplcv?utm_term=new+top+gun+2 PDF link annotation
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d177ff20---94525233887.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/lelebutofo.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/35255901477.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/jelefepoxixarux.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/piwejogozewuju.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/nivaj.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7cf4e40e55dfc2a2ad26ce00ca89c59c/pizukobalepigonikopepodi.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a2782ddc412f994009cce81fc09a815a/59761577833.pdfIn PDF document text
    • http://ibb-online.ru/f/file/dubuwavibuwesawemefum.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/boledefotudapunuxinuj.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/725004881.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/50805942748.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/weporujemufa.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/25233620686.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/51454170644.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/bifozewijoribeletem.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/xokefexodupe.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/demubeposeguzofi.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/pagakolojozesapafo.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/61080993188.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/gefuvefunuveziroxidubu.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418e9aa1457---wosigogoronusatuv.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/fujefanogagobifibub.pdfIn PDF document text
    • http://gojjang.com/uploads/files/6032302225.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_off0000c364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7B 10144 bytes
SHA-256: 0b2690986c0bb468934f41b9619c6242b581fbb7c448a17e1dfeb6aa0fcd1f0c
font_02_sfnt_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 17492 bytes
SHA-256: 33d9908ce93df5a14c0c03d6fc11b2df0238f5efc9d5e455a1e7af565612cfbf

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