Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a1c81a0df17298…

MALICIOUS

PDF

82.3 KB Created: 2021-08-23 15:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f09cfd9c7517d704d1c0d57871a1623a SHA-1: 42411cd23231b49863624fb486d91f04d00154d0 SHA-256: 45a1c81a0df1729870de8c9ab9a36a2927d9fdaf93340cb598e79bbf1a4d0182
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://andlupa.com/userfiles/file/razasalas.pdf In PDF document text
    • http://aurora-c.jp/files/files/rebogawumelugidov.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16119f32047147---vagisuzitigabu.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/fumanazarumupejebulab.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d57a48b2e---neletisenokirotavewa.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/a90a311ed492f76deba0df8164ed5ce9/55657998447.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/b558105919dd4e55bd5226f990379bee/tuvukipiz.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfee490c9c---63147270141.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/a1c8fea9fd5db3508d877976fd2e22a0/ligitafedikotifofemip.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/tifowusikoniniwemopitaw.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210822_1C28B540C6284B6C.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/0febabce1aabc7c05eb728311350cff5/24569974253.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/soxatowirod.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/nisasiwofifevadij.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/11893073932.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/79896872341.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/nenalidazijowuvakeluvob.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/68505304615.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a79fab33d65---welerizajavoxeliratebex.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/3116493066.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16102b2c81054b---mamikafibatizisagozekar.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/19364792694.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/83386437753.pdfIn PDF document text
    • https://soechi.id/userfiles/file/gaxoxafowukugabododane.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608397ce0f17a---somategike.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a836286b797---simemonix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=professional+email+samples+pdfPDF 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_off0000df5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5F 10560 bytes
SHA-256: 8d92c8792d8052301c09dec6c7b1ff6dbde3623c7782da85688fc6d911b99837
font_01_sfnt_off0000f75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F70 16748 bytes
SHA-256: 12f5d1884d1a5272e326964ca5a78c3d3d398f7825b5f2b34bd821070b378311

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