Malicious PDF — malware analysis report

Static analysis result for SHA-256 343e793c97f90faa…

MALICIOUS

PDF

88.1 KB Created: 2021-07-05 10:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9f2caf260913d4654c7a1dd590209567 SHA-1: 41d512067438314cb941670acec86efdc67077d5 SHA-256: 343e793c97f90faa333dab706a541b273c0d06a94268dbb715e828375dc5c0e6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the link farm pattern is a common lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=unseen+poem+with+questions+and+answers PDF link annotation
    • http://ruoumoc.com/upload/files/pisowubatojarovazuz.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/58004296959.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/54843451.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/24331331444.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3093fa641a---26233493285.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608040da64ae5---93085749490.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607821ed83cdf---dilogunofurilufesonutu.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/64378491117.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/f677c5ec577d18b185d10ed6fc4c38e4/letuguzibununupotaje.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/bfb6fb8875e1917bee27ae58f174a10f/vukiluxodoxexuf.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/18410518656.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dc9f932e688---penusanuzelid.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/64167665995.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaa9f5378a---fuzexatifov.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/fiposesuvadukebuzadax.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad12c3bfcbd---97746149680.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/215a08daec1c78e0602ee86de780454c/67589692327.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/67084515832.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a7e1be58d---gifumisibagujegof.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a961d03d658---didibuxenudewejadikafew.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa3bce4a2---54256159678.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/tubenipolu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/dcb47b4aff10fb5e3525d5b9a5a42a00/fexila.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c23f5acdb5---mimidar.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_off0000f5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F3 17000 bytes
SHA-256: 834e83aefedc2489b854a30c3e8793cec50194c92d396e6bed892977da844c45
font_01_sfnt_off000121d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139EC 10952 bytes
SHA-256: 4c4f6789a67108e3922314ae81f03abc72d8afb5aa283a2183ac6e4008491905

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