Malicious PDF — malware analysis report

Static analysis result for SHA-256 059ec5e843c151b3…

MALICIOUS

PDF

100.3 KB Created: 2021-06-27 02:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5e07d8c746ffac49beefce75b53344e SHA-1: 8f72743a8aba46fd632048a8c462f8ff1809f579 SHA-256: 059ec5e843c151b33df531a01b1e1f119b8d41fb6339ff452bbdaa787c73a811
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ukbvnfgc5o9jh0jprj51tvc66h/kavosa.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f82ecefbdf---65865994550.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/f8457f256ca98b9682347d66a382009c/85296641535.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/f281005e9094e59a900951723d0d3ddb/98589593477.pdf
    • http://ekolojikweb.net/upld/userfiles/file/28109731860.pdf
    • http://amphorabeautyclub.com/campannas/file/89449018228.pdf
    • http://stylekd.ru/files/gebugatapo.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090adb60ccc3---nenolerizuwujokoj.pdf
    • http://alliusie.com/userfiles/file/24235700583.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609286aed8e74---sawidukilisorifupetiteluk.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/kk04bd2u7i7r7ulepv1lficnb2/12867539937.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b27607cc5---mevexiwi.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/h85c3nsoi9k80hegj0jpa68rfe/22922023979.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/ed46b3e3fc43b3ab6e3acc048aedbd6f/63499228467.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/foev0vipfku2d8l2qh3jl1prg7/wilanarewodorebuwidaxuted.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078076dbeab3---49968936631.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160d23fcb8a808---fozuvopanezivoga.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097395aa73de---mopizegunuruwegebavojupo.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078982a8c55d---71291397095.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996a104cffb---libukajegunuvojixetizuni.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/a0d8d92873a8292f80277dbd4838cd9a/15579956281.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/875403d68675530a091cfa6742d6d913/zifebewuduwogozezonege.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5374e2255---78569729567.pdf
    • http://se-ty.ru/uploads/userfiles/file/labexikebuguf.pdf
    • https://gachbinhduong.com/upload/file/63131448334.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fix+over+whipped+cream+with+milk
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fa7.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 16092 bytes
font_01_sfnt_off000124ed.bin
5ac812673a550e21bdc1c406ba920314d887acdbbd24c275deeaab6def821213		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124ED 10828 bytes
font_02_sfnt_off00013df7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF7 16792 bytes
font_03_sfnt_off00015609.bin
1da3de84cf318221fce02fc65a4c57248ee872a4b695c27b26e1f20d910c409b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15609 17320 bytes

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