Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb230da23e77e97…

MALICIOUS

PDF

108.1 KB Created: 2021-07-04 20:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3ad8c3d7cbdae6190cd9b93f760c87dd SHA-1: 386594cb1d4270b6b0be20f7db777ce2f0cc9ca2 SHA-256: bcb230da23e77e97fb4d162fe0674bd6d9cf1c5f2f782f70d74dd99eb9a36ec9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are consistent with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://philabc.ru/uplcv?utm_term=an+organization+has+a+high+degree+of+specialization+formalization+and+centralization PDF link annotation
    • http://artgraf24.pl/userfiles/file/20224227082.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85301b2f4---jilotixelegusiwi.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/65709809568.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/womufariwatogogaw.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/2vqma3nne63tm2acuull3hhma2/90128359333.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c6f6c7390---sesoto.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd7e18ab39---xebifuvir.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d798a9c87c0f7326cd2dc9c9eaf18d79/tugudewagufumoz.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/35721436222.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/pebunitevoxata.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/a39cec982ec9393a27e2fe82fe5815e5/68642671389.pdfIn PDF document text
    • https://asi-filter.pl/files/file/xomowasupabanibomowipi.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/nch39h3jree6ghga6qbobimm0e/tefamijomofonefaxoxun.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/sprksboodndfrt7gklgrb3git6/98898009941.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/54398767179.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/6bcff3fd748760bb372d3de0fcd6478f/wekadowagemozipofapome.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/21289581517.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/nanozaboxopama.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/eo6qqg939irud6i2u2lubngs0o/36747481743.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94c9ef3897---zoxuv.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/wuronelinajafezejaw.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a2b96c5dd---68173273863.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608abaa13abc7---87609566745.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/0a1d342a906eef1a532a429719556f18/13218057111.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_off00014441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14441 11108 bytes
SHA-256: 3928341d12396f7cccd3b59a19ec7dbb704d65c35aff90bea690912065befc66
font_01_sfnt_off00015dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000175e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175E8 17052 bytes
SHA-256: b8a87a6efe1f295a0c66fe9176ca6efeece4e495758dbff41939005bb55db8a0

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