Malicious PDF — malware analysis report

Static analysis result for SHA-256 14d03fe4b28e4756…

MALICIOUS

PDF

76.1 KB Created: 2021-09-05 09:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6d3a996e8508f87b67d123a13ca5e637 SHA-1: a8b9f686f3a59537dba3b3916463253a2e808dab SHA-256: 14d03fe4b28e47560fb63e243744dfe6afe55e19620172cfb17f5a8ef875398f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories and disposable hosting, 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 delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.alexgis.com/siteuploads/editorimg/file/wisix.pdf In PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a09ff41076e---2961533811.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71d5f7a33c---dawizavines.pdfIn PDF document text
    • https://vleek.com/uploads/files/tulin.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/58938372302.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc03d538e0---wekovewefadasekexebu.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/51461618538.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/23356572692.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/73488038325.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/walevivavoguwa.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a802eaa95d3---38952123107.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/72601892010.pdfIn PDF document text
    • http://thaide.org/userfiles/file/72377024268.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16119cdda1a98a---fetab.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/kafodaxowor.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3004bd94d---dovumisedepuwizodenewu.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ct2jv15n1122jkhjut21fc7cbh/714935223.pdfIn PDF document text
    • http://belloverde.net/emailer/file/fonebimedesegefug.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/lpcivi4k3ab7jt1umjo0q7ipc0/zenuvofegedoledabawe.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d00683f42---bulaketelexaleguw.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/jopusonalozoweminozutela.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/5040c19ff094a645531a1fda04da3ee4/85057106544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=fifth+grade+sentence+correction+worksheetsPDF 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_off0000c9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 15784 bytes
SHA-256: eed513264439d598b9c282459176aa372abf1c9bd558a38b4c9e94355d2eb2ae
font_02_sfnt_off00010a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A21 10864 bytes
SHA-256: bf7c2a46bfc2604193c360b9b8af53b88cdcb90c2459b876edb7715cdffb7076

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