Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a0d0e61e3aaa41…

MALICIOUS

PDF

84.6 KB Created: 2021-06-28 19:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a1be226e180941a3742614c5d4b3c008 SHA-1: da4f418d938e365a73c229fc0330a90afbc791cf SHA-256: 88a0d0e61e3aaa41c5ed077a341bb13e82721e9c28b5a0210e0154296b7c0b87
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a raw IP address in one of the URIs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and heuristic firings point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/83be60cff70b33be2bc49e2b86f3da28/segomuf.pdf In PDF document text
    • http://kangs78.com/clients/66216/File/bosera.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/f85367fa70645d71ea7e89d40be4ffeb/61670384706.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8add9c016---devobegigatofiw.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f08d2d2b6---wapal.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/36f4109359df894f21ed34bcc8cafad6/67653763467.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/630826e17bd3a01a940ab2cff099aef3/puvudojimivogedatawe.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/52038513058.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b1242702f---38097399700.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bf68d706b---7634101720.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/add634bc3676416744be64617882f608/74937804825.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f240899e4---74771071070.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/035800abe5eb605b370a1e8e3693af9e/74148498240.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/51913463150.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/hu1pfp9gvb6fevrtmhu88gcb9p/91399578883.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/fajijiw.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/digov.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d364bce0f24---79398352205.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/83061678638.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608deaa1381af---38375596647.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/45on3mip1fvh12v1asb3jt1d4e/64193296151.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/rgi6fnkkgq8lgl0g337aaghprq/sijuwi.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608caacad1386---32459069520.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2c612a6b7---kekadekofudadojutajowat.pdfPDF link annotation
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cebca4c0ca---5799768105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=xuv300+bs6+pricePDF 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_off0000e702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE702 17496 bytes
SHA-256: faa46f89dcc71f9c4a7dbfa7f25cb903fde3cb6fa13679c6a6dc2e61821bf98f
font_01_sfnt_off0001152f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152F 10612 bytes
SHA-256: 2e08f0da6e6908ec43147c511be951bc237294fa9a3d2f57ce4f494e72226dd3
font_02_sfnt_off00012d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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