Malicious PDF — malware analysis report

Static analysis result for SHA-256 06d551f0e06b6750…

MALICIOUS

PDF

72.8 KB Created: 2021-09-05 19:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8a0cca62795294eb4126316fb097440e SHA-1: 7fa0bd8b16dee38b539e56635c8326682712fa88 SHA-256: 06d551f0e06b6750f09f9ee791cb9b567e9e0d2a138da01179b8f6a6e30eb70e
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL targets are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/a6e9ba2d7865eb5c1db3658fafe5690f/gudafuzijijubamasomi.pdf In PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/eb1c63bc08b1f30c776351bd98d0b36e/93430272402.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/4a80632fc0f7cc13ce18d0727fac02d4/nanetubewubelogaf.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///45882791800.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/38496993393.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/iluk.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6cc6ad0b6---gisedaju.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/wovokobuno.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/853857789.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b16653a105---jodexipubekanovazazo.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/pivoduw.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/5796b62f7067f543dd1106bcd8417ed6/lumobomadakizejo.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/kotokowugetuk.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/bapojirafowatetudugogowu.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/kulopesodo.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/panh97b7el26slrs2brtje7dl9/visabojanurusobotuk.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f8d86e2db---58519769427.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e4d5d9c6e---vekuwugigipugawekefodupu.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161244a3a28a60---zuxokodawip.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/18489377339.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/66794641144.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160706ff0725c4---48302318465.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/ladinokexowa.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/loparojasunapoziboluziro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=graphing+irrational+numbers+on+a+number+line+worksheetPDF 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_off0000b9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DC 16400 bytes
SHA-256: 99b4c0ec49a2aac12b228f8d8f3c10f1da8887025e9e56cd96ccfbb7c42c34b0
font_01_sfnt_off0000e3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A8 11156 bytes
SHA-256: 4d8db804a6f4502219f9dc5686eae378b82ec0415615591a21fd02699348fade
font_02_sfnt_off0000fd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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