Malicious PDF — malware analysis report

Static analysis result for SHA-256 1635f38aa0df5505…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 17:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6961b3c456808900ecd5098793c3e344 SHA-1: 3d404a8bb35f38339507e25f5f48b0bdc81d05f4 SHA-256: 1635f38aa0df5505d04865993eb9da293d47652d28a0aa73e0168226dd4076d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute code, likely to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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 https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/1fm3q7c6i5qipaass2s8o2jgos/79562783103.pdf In PDF document text
    • https://csodamalom.hu/files/files/goradojalev.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2434aa0817---sifuxeporo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/nenadip.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/83823822309.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3dba98709f9be61ef0c157cb2c526fb9/74938169278.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/48476532455.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/5b7612f3dcf98dba0481b84d430909a4/76584542952.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98947773738.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/zofobedutafuzomej.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/jeruvipokenaxesobit.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/dk8ds5kpqod40lc7msmjehtjff/89391517578.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/jizawisode.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/difogetoda.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762c6c4e834---jututaxibim.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c05accbe97ed434ab87a54792831eb58/83236658830.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/pezejebogusomalit.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/wepipe.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/selutitesefinate.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/23320270404.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/69162719112.pdfIn PDF document text
    • http://intersonik.eu/upload/files/66687124173.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/26443605887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=r%C3%A9glementation+prudentielle+bancaire+cobac+pdfPDF 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_off0000db8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 11236 bytes
SHA-256: 8003952e7ab5c2066a30f7847bd37bccf85d7ac1afb8471b22998d004e8f3969
font_01_sfnt_off0000f512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 19820 bytes
SHA-256: 7ab3831072ad9991075880fb1980ee2b4cae1876fdbcc533ea259b4b597c6646
font_02_sfnt_off0001277c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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