Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8907ee1a9920f5…

MALICIOUS

PDF

72.7 KB Created: 2021-09-28 00:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 083fe3650e3b1c034b2b005517b054ea SHA-1: 020521787de6e97b004d1cea1278a1fccc38bc47 SHA-256: df8907ee1a9920f57c75cb583e12bc999c29a78381a4dc637693563335131e20
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. An embedded JavaScript stream was also detected, suggesting the potential for further malicious actions such as exploiting vulnerabilities or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=tab+android+studio+example PDF link annotation
    • https://goldgreiner.de/userfiles/file/86672514780.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9f563fb0c---60786126093.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210918092302.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/63661885174.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16140255d17abd---27036619269.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/jakubekodebovodana.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5ec9d0f61---42953043244.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/44681869043.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/67922562936.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/fexal.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/vipusenu.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/vuwiko.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/87596474962.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/bivozopovezanugexozipi.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/buzezelulatitupuba.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/36875921316.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/makodufexetufasaguxotuviv.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/widijofesewadal.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/tuzopovuwagobetulepa.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/8069747752.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/xowelikagajajovo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/24957173943.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/jekalidisadijopuboxex.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/92117426980.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_off0000b463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB463 18052 bytes
SHA-256: 31897aa45edc996c4a8307dd6bffa6b2ede9b193203c45aa82e3211e3eef7c93
font_01_sfnt_off0000e3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEA 10860 bytes
SHA-256: df15d4fafd214ba03520ecb6e3aecd5b7df2654476ab28146e45e9dcf9a66591

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