Malicious PDF — malware analysis report

Static analysis result for SHA-256 71315e5873416dca…

MALICIOUS

PDF

88.6 KB Created: 2021-07-31 09:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a27b15abb57d525e46d6ef17337a586 SHA-1: 50283e271e1f29b986afd605c1c72ef5144e8822 SHA-256: 71315e5873416dca7e956c4b11a79be216a338f622dab880a79f95c2378496b5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to numerous external URLs hosted on compromised WordPress sites and disposable domains. The primary attack pattern appears to be directing users to these external sites, which likely host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://synerhu.ru/uplcv?utm_term=cuales+son+los+beneficios+de+consumir+clorofila
    • http://amuseonline.com/absite/userfiles/file/visaluwapiwafimaxed.pdf
    • http://medtravel.lv/images/hand_uploaded/files/lazukememasobumideposil.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f4db8b946---jijugomekur.pdf
    • http://safeabortionnepal.com/userfiles/file/pukemoxo.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/5785d8eee7c486b507ad647a55ed6afc/mixeb.pdf
    • http://xenangheli.vn/public/files/tevikutixijewotimavu.pdf
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54885799302.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16100534dee5c4---fezev.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996dcd6f40a---6508973169.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bc43cf9a5---xezatejuruzokujofuf.pdf
    • http://sieuthivatlieuhoanthien.com/upload/files/rapen.pdf
    • http://beveragesgs.com/userfiles/file/kusim.pdf
    • https://fokusmedia.com/images/uploads/junusapokewanejebekeduf.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/632b8be8f663604b2c13c70e1d60e831/82260302333.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/96b24d8987ad5eb7815f49cd8828754e/36222025937.pdf
    • http://arci-mp.fr/admin/File/zepipofotedupekelewedok.pdf
    • http://fst-uinsu.net/userfiles/files/wugumesepinatiza.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ab44c988617---pomubokadomepulomiguta.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/32373091745.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607defd17094e---11954222654.pdf
    • http://thaoduocvn.com/userfiles/image/file/kapurumevusade.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/5396bb4c5622738cf86bca7d2ec2f3d0/26411610580.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab6458bdc6---dutatug.pdf
    • http://opusincertum.it/userfiles/files/nutizive.pdf
    • http://hoaisonland.vn/upload/files/18004795235.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1436d5df02---rometekefipepo.pdf
    • http://zuche0551.com/upload/file/jojuxem.pdf
    • 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_off0000f636.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 16792 bytes
font_01_sfnt_off00010e4d.bin
ef20d67d72b39c4f8d7ca4c0670bb591a3138adbaf258bc579043a5d8d12b1a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4D 10808 bytes
font_02_sfnt_off00012727.bin
a0ab1b9c7be79b588d77084b8ee63a78becbaa25454284581423476162cf2952
pdf-font-stream PDF embedded font (sfnt) at offset 0x12727 17792 bytes