Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7354c3d27a7f19…

MALICIOUS

PDF

74.1 KB Created: 2021-09-16 08:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c93f87620e865cfa70e68c250f1378d5 SHA-1: 527b590bae38f54edc3579d62d141bedc22221fc SHA-256: 5d7354c3d27a7f1922a256a3293e7aeeaf1a263776f0b34ae3cc92ac9829b577
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://altadirezione-consulting.it/userfiles/files/begel.pdf In PDF document text
    • http://www.gonouvellezelande.com/files/11343969654.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/26275570080.pdfIn PDF document text
    • http://iucecb.com/files/file/pokudovadudononus.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/xires.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/cf9816776dc9b0150b55d91ae0d83286/wuradukorubugebuvitirufox.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/16636872933.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/fabilefokux.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/49389208033.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/68671720871.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210906195521_1543581290.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/88549056216.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/57152204639.pdfIn PDF document text
    • http://trivio.it/userfiles/files/71651955781.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/mizesevabif.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/51014798659.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090804093973499.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/buxijogovebagase.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614198d952394---girepelusosuka.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/10644685698.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/fa209f6f362c2b7281d8ba860f5e3b78/dorutujageveminomuw.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/vutililejadenokoxoge.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/25555266722.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/mebugugima.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16142c41732777---garusubexatagobumomixusob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=antutu+benchmark+comparisonPDF link annotation
    • 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_off0000b638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB638 10908 bytes
SHA-256: bc4d0c3e257ab79c54bd2cc8638dc9c2cb8860fa89add44154cb36680dee55fe
font_01_sfnt_off0000cf1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1E 19116 bytes
SHA-256: dee1fae1c774c47e719ce84670cda82e9e635f1957165d8e5a0ef199c4e092ae
font_02_sfnt_off0001010d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1