Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5d3e7a3f813a05…

MALICIOUS

PDF

86.2 KB Created: 2021-06-26 10:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98a48bb45cd261ce4d3156cd020318d9 SHA-1: 6d48734de7d3cd5702fb311b603b75954edc3bb3 SHA-256: 5e5d3e7a3f813a05cc3bb05c7b47e0c5e10800aa886046a372124ae548ea6524
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, presenting numerous URLs that point to potentially compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be directing users to external malicious content, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3cc5b173c---54492551519.pdf
    • https://brothers-music.com/ckfinder/userfiles/files/56850203830.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0939e08baf---63517694272.pdf
    • http://burmeseburmilla-allevamento.com/userfiles/files/fakinufeto.pdf
    • http://szyuangang.com/UserFiles/file///tisekizuwo.pdf
    • http://easyreturn.store/userfiles/file/fufanuguzu.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/ab5750d77b8a6260fecd115daab07ba3/99700476199.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/wobudivolizifobixuka.pdf
    • http://micronforgacsolo.hu/UserFiles/file/loparifajoramugupegikukig.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/jozerulufosi.pdf
    • http://chiaranannini.com/userfiles/files/gupisilawefusasixexepise.pdf
    • https://gamedunyasi.com/calisma2/files/uploads/loxonuzewuzotafezubefuruz.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b6a6029d8---55050156581.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/6c8cf645780f3d00d0fee9fb4edc6ea6/guxoririlabizajavefibuv.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085b47800ce7---85088281868.pdf
    • http://rmgoals.com/userfiles/files/nolanomopezaxuditeros.pdf
    • http://dzbnf.com/upload/file///boguvotojidiferubewu.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/eee2e265e34589a028506a997028bf41/99620558202.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/nradag0rmcv1l0o9u8jphq0d73/bufona.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/69ba18e965c43a8ffbfce7a5506cd7d5/40602300307.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/2d3797d5120948587bc194fb0f0241d6/pebivet.pdf
    • https://khanikango.in/file/wujenotexojinafag.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=communication+and+education+technology+book+pdf+download
    • 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_off0000ea27.bin
1d09915cfae9f9eb628755a192b865815c35ce401090d1e891312024322fe47a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA27 17652 bytes
font_01_sfnt_off000118c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118C7 16792 bytes
font_02_sfnt_off000130de.bin
88fb65fec882a30cff1b10bcf12fc4069c62663434c6ae7cbfe1ebf53d5c7ea2
pdf-font-stream PDF embedded font (sfnt) at offset 0x130DE 11364 bytes