Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3c5aa104ed384e…

MALICIOUS

PDF

71.9 KB Created: 2021-09-03 19:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6425e8c5e7c3cd44fd58e9666ca8ac4a SHA-1: 8a1fdd238789272f66317432738cf7446112cac2 SHA-256: fa3c5aa104ed384e0ce7393b1aabbd42751674e69445acf9bc76dbd1d18aa5e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score strongly indicate malicious intent. The primary goal appears to be directing users to download a PDF reader via a compromised URL, which is a common lure for delivering malware.

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://wastran.ru/uplcv?utm_term=download+pdf+reader+windows+8+64+bit PDF link annotation
    • http://iccjsc.com/images/uploads/files/detavemi.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/vprobhgdu542v0v5s5u34dk543/walukukajovotewugerifole.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/73223496722.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/naxijeni.pdfIn PDF document text
    • http://carszana.com/image/upload/File/74112192759.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/33861348634.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/13142422910.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/pibowofejatexivefod.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b01bea204---66469528574.pdfIn PDF document text
    • http://balone.net/_upload/file///tobod.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202107file/2021070119074070554.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a3be684d1f3---vixosisono.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/72724328684.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607522753d385---vegaxefoki.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/2b576a400c1ce13567b72b78714be32e/75520798486.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608628bc5e9d4---7345978062.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/68985083973.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fef9d9733ca4ae1fdcf1f608df243b4a/38019690920.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612951d306412---48887246271.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/radavofalo.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210807031029.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160726a35552ac---17665108521.pdfIn PDF document text
    • http://cecprint.com/images/file/39534159456.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/8417d03a64ca981a95b56caebb4cf95c/33113918916.pdfIn PDF document text
    • 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_off0000b6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E2 16064 bytes
SHA-256: 2c064d97128216ca301e233cf47fd2934c392297d0cddb0188180535ac90f386
font_01_sfnt_off0000dfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 11172 bytes
SHA-256: 4d24f65572eb269b5448816f3cd4f9094b7d681482389a6f9ae1d55be1c630b8

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