Malicious PDF — malware analysis report

Static analysis result for SHA-256 a566f7be9165d3ba…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 00:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6eaa9f3779d14133514f921b23a6a0a5 SHA-1: c70f430aa6612710a1f8ee5a933794cdb5c545f1 SHA-256: a566f7be9165d3bae9b54a5b9fbf62f2efd8c7f75dea9dd7b70c8bb53154160b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites for phishing or malware delivery. The presence of embedded JavaScript and the link farm structure strongly indicate an attack pattern aimed at user compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://seosanhrd.com/userfiles/file/dedawelewowejiwejaseraber.pdf In PDF document text
    • http://idealthailand.com/file_media/file_image/file/wizamenidenigumeradog.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613428e68af05---90963311153.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/63353884566.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a5fe465fb---wasegalemu.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/jutuwexegiv.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/61637277301.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/61386790007.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/vafuwirupogadetuwup.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090702181673499.pdfIn PDF document text
    • http://mobitransjogja.com/files/57810540984.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9d6ae6cbe---jupatebilamowunelubo.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/rifisi.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144145971dc4---25635954466.pdfIn PDF document text
    • https://jensbrode.de/files/file/5877887098.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/samomul.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/62948911558.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/fudonarelo.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/83019902985.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/nijesubunovu.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/labewuwebulo.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210907180453185.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/79936791927.pdfIn PDF document text
    • http://getem.eu/files/file/vuvegemenakosifoku.pdfIn PDF document text
    • https://camelcarpet.org/d/files/pejenofojelekilokimuwijid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=parallel+multiple+account+apkPDF 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_off0000d5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D7 10560 bytes
SHA-256: 93c48b36101b096b685a385b60eb59337da0cfa4e26d00d82cedfca05a396038
font_01_sfnt_off0000eddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDC 17684 bytes
SHA-256: ed9baeadfef86a047e006deec9e30e7097c56d9a29f4c8e64f808a27acfb9513
font_02_sfnt_off00011c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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