Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07a18e8046a4152…

MALICIOUS

PDF

76.4 KB Created: 2021-09-10 15:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b6da91e23c96e9869a18fa056b35110e SHA-1: c49707f2d0e168b9b2278b4bdc25d8168855440a SHA-256: c07a18e8046a4152f25dd5f83b716bdf180b2ceb13c8178fc84d87834cf6b1eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous embedded URLs that redirect to various external sites, some of which are hosted on compromised CMS platforms. The presence of these links suggests the document is intended to lure users to malicious websites, likely for phishing or malware distribution, aligning with the Spearphishing Attachment technique. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://garglob.ru/uplcv?utm_term=zombie+shooter+unlimited+money+apk PDF link annotation
    • http://resheto.ru/users_images/fck/file/sebem.pdfIn PDF document text
    • https://seger.cz/userfiles/file/bewinopojunifaguxirupinav.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/guwijibobakobiwena.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/74811184187.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/7bc0fdf508a5afc43c3b8dd130a072bf/fojimizos.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/nokavojezajuzila.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161310b0ce1384---nirimamipewafizisuku.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/26401458521.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/ruzupetulowupezimozomu.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/35761156567.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/03def3ce3c414774ae1ab2e9ec326c1b/43568452536.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/xudinufunupisazirerebukiz.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/gakejelodiburivagibexolo.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138dc8b6d0a8---wexizar.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/174193472.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/vinagi.pdfIn PDF document text
    • http://blueyee.com/upload/file/021018572706.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630465214.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/wewajulurupeneganiput.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/41135436253.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/jujoneta.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/wumozanaxujurige.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2758d750cf5123496d4bec7d6ede55d3/51238646538.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/lozowaliraduzefuwedozu.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_off0000c56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56E 17264 bytes
SHA-256: 2649edf3266ffefa3c8f1dec83f96d84ff151d6b1cac57e6c035604f4af0173c
font_01_sfnt_off0000f279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A90 11068 bytes
SHA-256: ff26075335dca45da6f821ec364d0036bd0f10b2fac346be633a2d1d83bcbbba

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