Malicious PDF — malware analysis report

Static analysis result for SHA-256 87793c63a11ec75d…

MALICIOUS

PDF

92.8 KB Created: 2021-06-28 01:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10004019d86516a6e37d9a28a69e5df3 SHA-1: a915910216efa518bf79ffde4b96dd6aa30ef9a5 SHA-256: 87793c63a11ec75dc812bdaf71c8513f2ad8a48dfea9f7db196b99be8b7cbe04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm for SEO manipulation or to distribute further malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160761cd77f4e0---66307517031.pdf
    • http://aostavet.it/userfiles/files/40458498989.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5d865ffb---6353132962.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c30ce41fdf4---38299776236.pdf
    • https://aplusadvance.com/naver_editor/data/file/gurarotulepegugevisoka.pdf
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/81413170948.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/hup8khd0009ptfnoahkm2qqs10/diwadotugav.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607015f671a21---90850165620.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787e4c17f0f---87720697201.pdf
    • http://daoltrading.com/userData/board/file/33550951533.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8e1feafa8---xutabotibawizulilik.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/efa7ccd092855263f879a094afa80735/valemobakimo.pdf
    • http://jar-ted.pl/file/78476947187.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/e971e57fae835944df91d79e4ead1b85/vodonogu.pdf
    • https://akapacha.com/userfiles/file/21715196797.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160acb99caf58a---dixatakaluv.pdf
    • http://playeasypiano.com/resources/fck_images/40084851234.pdf
    • http://celcg.pl/uploaded/file/mejan.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d42f9a06897---38882738786.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/r45r58op8gd90gl3kadsadus09/zawaga.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f561efeae---zoguludugorugoli.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/1eearp65h23nvqm5k2t8ilkj1c/78027627350.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/7e59bd2dd11dabc63d36f22c8050f510/4047239143.pdf
    • http://angelcabrera.com/FCKfiles/file/86124729056.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b01f1a7a58---veloxozelapoxezotike.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=interview+questions+and+answers+difficult+situation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010685.bin
4e2b647d2d86b3e3dfbb7c36698f838ad0d21be6b1a06dcce2a41119b3b599c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10685 16972 bytes
font_01_sfnt_off00013278.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13278 16792 bytes
font_02_sfnt_off00014a8f.bin
54b2ec597a35f2df6b8e4fb9c5cb551633242c03b2bc4005533cb5860ffa7d29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8F 10816 bytes

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