Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b045329781f0a1…

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 00:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad136bbe127af1c3279db7b97c014eba SHA-1: 6639be1610ad262badb25ac910f626c4f7f9074c SHA-256: 09b045329781f0a1a557be629396139b2b7a3e166b537dc4dca55109768c96f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=mid+century+modern+architecture+travel+guide+pdf PDF link annotation
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074260a8c7a3---54281115010.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/95991982686.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608278f65ad21---77963851026.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/32978087322.pdfIn PDF document text
    • https://makenie.com/upload/files/ledirilevufamu.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/tanezomupuzumesejep.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/60647328732.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a26f2a93bdb---ganimiboxozaliba.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/guritakudotaxasulixuwulid.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/lelewavorumapikugom.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210726_120950A991625D83.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/durm2ag7phlvatg7ntlr1rsul0/29043348643.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ea15970a2---kuwoxofi.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/82487613327.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dc68d230895---44570004440.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c98505ee758---77818700868.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210731211812.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f7ce0e7de---52419318147.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/68aevb386dal7s79kbp6om2k64/17476481772.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/toniriposur.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/fifajepaxivajivutiva.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8cc4e4edc---wevedevoti.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/xaledegotug.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609693a61290a---vogojixob.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_off0000e89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 11172 bytes
SHA-256: 601ff8066f19eb3565727d3008c6d4841ddcea9edf184593c503a5c31c007c08
font_02_sfnt_off00011a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A72 18560 bytes
SHA-256: 39c30770d97276e1a933b9238c3fb5a2506e4cc365aac414ff4b475966837441

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