Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb8345a036c5ca2…

MALICIOUS

PDF

74.2 KB Created: 2021-09-07 04:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c0221f2dacd462becadbe62ae53c5208 SHA-1: b25e7ae6f4fbbffca1ce6284b5fbd82be757ab04 SHA-256: dbb8345a036c5ca25c5d19ab6c4aeaf8aef7cbb06693ab169b32c6d72f7a3661
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to exploit user interaction via these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=upsc+csat+paper+2+2018+solution+pdf PDF link annotation
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/625c4a3fa06c68be7b638cb5ef3b3432/vukitam.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/vapipononoto.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/tewevanenifo.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68eb7f07a5---kemirejetewedononajox.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210630004345.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/putojemeroj.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/11565046582.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915dbd61ab3---bukefaximega.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/56625106078.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107e664c9acb---32219013343.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f7d75e743---25244820794.pdfIn PDF document text
    • http://gestmase.com/media/images/file/fokilezugov.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/96659890266.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f010129d496---42188314610.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210819_0B23A312CC099A5D.pdfIn PDF document text
    • http://richardsonfamilyreunion.net/clients/7/79/79e100fddb184f5a3447a495e7c481fb/File/90452388244.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b21465d7ada---razesezarawetoperu.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a89e26142a0---62565076059.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/nelalusegawidurunigemiv.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/ripuxunozuravumom.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/94658041023.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/qdhdk29iq20on23niee0i76ft0/tepiga.pdfIn PDF document text
    • http://klefmarken.se/upload/file/68937152236.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_off0000ba67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD279 17600 bytes
SHA-256: 756818570992744b599eb90b58b54030d5c3ff889f21c40fddb02e4c6bf365df
font_02_sfnt_off0001002c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002C 11220 bytes
SHA-256: 8462fffd8a6e78a8955efcc36f30aa59da0d6cedde2b50683cc5131eadedfd0a

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