Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a711347b614d9c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 20:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7d87b745d7e63257d079419a6d13a35b SHA-1: 7df16e3feb9a414071282d2a27478b54c30cef81 SHA-256: a1a711347b614d9cc8d325f5ab6f9759ec216aed26659ef4d17e6d754bb46b8b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose, which is likely to facilitate further compromise through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e932a84b5a7c1a15f662dcd23d32f9b5/62053348844.pdf In PDF document text
    • http://kor-ra.ru/UserFiles/file/guwovajajobenofiv.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4f82e325a---31867322948.pdfIn PDF document text
    • http://planetamama.ru/files/file/11465845018.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/74692383161.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/89053597490.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e43ac9a91---11914280852.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/pifuwogefedi.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a594e2cf4f---9444187869.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e6e707efef7---91279971107.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/dimeniresovajafakepomo.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/7a61a1nn70vabmklsp3eda82p0/84108167068.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/lezokunumepeti.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/28430499928.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe65f3d3bb---90821818998.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/80532066208.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/l1uqk5lrlb79gh3b3e3j42802d/zipak.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/numaperadawu.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/52941221044.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/sesejijarevawududekad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=centrales+hidroelectricas+de+venezuela+pdfPDF 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_off0000d223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD223 10976 bytes
SHA-256: 4896413cb70de5c85949dee79fda73104752546e5f8c4fc15690efc1c00d8af3
font_01_sfnt_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 20824 bytes
SHA-256: d687ae9a047a00d4763ed1e52c3e9cf8982d9335c48db7f0f8d750a79747e8b0
font_02_sfnt_off00011f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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