Malicious PDF — malware analysis report

Static analysis result for SHA-256 1167a447d1e199cb…

MALICIOUS

PDF

93.2 KB Created: 2021-08-15 14:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f5e4e37a1d415aae85c03a4ea37b9e44 SHA-1: 7ad115bd1b3cf2526384935dbd81528d7358d772 SHA-256: 1167a447d1e199cbf953ab532e072e9f8c67b381c993df31a399209e2f89d42f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa4dcc8544---kabalutiduvetojebujijiwex.pdf In PDF document text
    • http://vds-construct.pl/userfiles/file/98558660943.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/38734cb70e9610691f3776338464547e/xumobogedomamuzefezu.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/70619622025.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607237079fa7c---13297255843.pdfIn PDF document text
    • https://medpressa.ru/files/file/nixodusidavogivesiwuje.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087fac6ecc3a---liratusemapabafowelexarop.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/20da3a7c0d8eee1479d04de2d6ed1338/76479259122.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/2850843167.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/cd67486798b8b95cfb31fb7c930b6813/5396163982.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4980b5a6d---rinuf.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfdd0a4ae0---mobabizemezowovotusetopa.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/51165177006.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/96082000691.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/wikedunuxut.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///71159543950.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a919d7bbe3---vigiriwewugikarizabuba.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/34086657613.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/qq4gkm8l53fc8hrf9ltesm17bi/61303322607.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be530fc7b86---67685539900.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b27d8dbf5---51090696149.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/ratoge.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/jomasevufiguxufexuwezaleg.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/63656328161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=oraciones+compuestas+subordinadas+adverbiales+causales+ejemplosPDF 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_off00010440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10440 17740 bytes
SHA-256: 7066603b7e36c70c2598be0b7372ab70182274d2dc5f48b6c8c2a256355bec9c
font_01_sfnt_off0001315f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315F 11136 bytes
SHA-256: a32ad03e11dd4ffbfbe3eb79ba6fca738f0f53969ed5e66d5111e49ec8477487
font_02_sfnt_off00014b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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