Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad451ddf43818782…

MALICIOUS

PDF

80.5 KB Created: 2021-09-02 04:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b33c30f9cb99951a6860cad71e02b957 SHA-1: ece4cdbf4ae8b730bde628a5b3a87da596ce07d9 SHA-256: ad451ddf438187827fadae381b033e4162301d2356f4a1a1afa0047d06e9fbd6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also features a link farm pointing to multiple disposable hosting domains, suggesting an attempt to obscure the ultimate destination of the redirects. The presence of embedded JavaScript indicates a potential for executing malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/9494767011.pdf In PDF document text
    • http://doradcyprawni.com/images/pliki/winedebin.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4f3818869---rukivejapunigulex.pdfIn PDF document text
    • http://gewald.ru/content/Files/tefededikozo.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/61663803088.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/80969629277.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/fejose.pdfIn PDF document text
    • https://badrivishal.com/media/24775419087.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae686f86162---zonemaxitavasonum.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b86716c5059---33351744400.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae51b823807---xodubinobokurisupo.pdfIn PDF document text
    • http://mobitransjogja.com/files/fulufewinukaxutiviro.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/dezapekadesibanojonug.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/59655325057.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/fivefe.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/39462861825.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/45349445165.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/af2986720a055d80615e7171d70b5d53/litibugopaluvo.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26c6050cda---borukadudevaraxo.pdfIn PDF document text
    • https://estoniapools.com/contents//files/faluparononat.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/09eee4c0ab7849a6b41ec52fccc8a306/92016085566.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/wedazusovadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=thank+you+lord+blessings+on+me+lyricsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF38 19332 bytes
SHA-256: 1ecbfb93ba4daf472681c5fd053c9f57354bb5cceeb34f8a4b185c786a7841e7
font_01_sfnt_off000101f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 11128 bytes
SHA-256: 6074ad4557e66f7860e96fd54f4014031327755367f67a1f0d30f86befc7816c
font_02_sfnt_off00011b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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