Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8f6b75c4bcecad…

MALICIOUS

PDF

94.5 KB Created: 2021-07-02 20:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d5cda5f4dfc3c2d05fbe405b187ebbee SHA-1: bd4e18849ab2873bff4b5184cb5fb956c27a5b94 SHA-256: bf8f6b75c4bcecad90f156c7a4813c43452aed33036399c90381c8f49f369fc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised websites, many of which are WordPress installations using the Formcraft plugin for file uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple distinct hosts and the structure suggest an attempt to distribute malicious files or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855ca5a202d---mazepexawik.pdf In PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160abed1007c23---27960782392.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f340442d2---59020923555.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af3bb88f1eb---15951324968.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/233ef5ce4cf8ed5f7b5e86c1e54347cd/tebugenovibinel.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d7669876b7ae0c98d8b9ec361c914d81/toruzupanewunudodo.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/daxiluboxakidasadufuza.pdfIn PDF document text
    • https://bdcomunicazione.it/file/70387716303.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160873ba252e0c---36547785943.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/6521621010.pdfIn PDF document text
    • http://tulga.ru/editor/files/11432603375.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/nixefafafokutagenak.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00abb16f84---vumikexepeleweru.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/9207171408.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/9334994826.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d357d52b9a---xofopedune.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074b260c3f2b---3334384200.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074b373ed775---89210812123.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160baae2f034fa---44894764710.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/belevepawewajopikavem.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745fad2d555---wodenufukabopupalufuxug.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160937e9f2e78c---jisusomovusirabapujaxix.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c2a13436a---wimowanojelevevu.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/3g634r8eo4ovos2a4s7ta5sp33/jipefejonas.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/sijos.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160840c118eba4---xixivexuvodupale.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/9n6nabmg674cbg4rp95qlmnfhv/95442291499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=formal+telephone+conversation+dialogue+examplePDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/takideguruloruvaboromo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000ee1a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEE1A 18020 bytes
SHA-256: 4d194a0fec587649635af862d7251606b7b18cb777a2c26f5690884c22e39542
font_01_sfnt_off00010a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12290 18540 bytes
SHA-256: 27a442222b120294519513240679895cad4327543c7632c0ed3d906a9f832ede
font_03_sfnt_off0001518f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1518F 11204 bytes
SHA-256: 695325dbc46fe724d9dd2d03b5ade7868d19bbfa2a9bd8aad77d1c74ed4f7be2