Malicious PDF — malware analysis report

Static analysis result for SHA-256 61195ab6b9e2d449…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 07:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 15f2441ca8c7bb03f4e37268f0d68eae SHA-1: bd560bc0ccaa0bcc28276eef4dcce888daa36f54 SHA-256: 61195ab6b9e2d449fddfd3ab770755d47f5c7910ad1d371d2b2948e54c293657
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with techniques used to deliver secondary payloads or redirect users to malicious sites.

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://krisoc.ru/uplcv?utm_term=talon+chainsaw+ac3100+manual PDF link annotation
    • http://bronia.org/userfiles/file/36951183144.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac824feeb33---zopagobulipazimas.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/vqb83n9030ttitdaf2udkke7gp/51240070543.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/49624891629.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e5b7bf28c---matowuvijoroj.pdfIn PDF document text
    • http://otczenacts.com/media/files/33728882003.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///vadesuxu.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/c7012b759de553c3535ce7bb25e5390e/28962803028.pdfIn PDF document text
    • https://morabia.fi/images/file/gegisemitexoxifadogezugad.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/f031885fa2b86145b36459786509b86b/zavuwugometame.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/22603029007.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/78560076080.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/nvrq96tp4lii579i9hnrrl6s1n/zunimubufa.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/5328968659.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a52f5b45b---tijawevudikefigixa.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/88c65033f7bfb88c4ac2383fa4a685d6/87601171853.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/jdfkigpvmpcc1tsa662q111hds/sinukejefuvatubomoko.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/febf5683d6fe67f98d0c40506c5ccad2/zonomorawenatawotava.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210709073533.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/tisexavodikakiduduw.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/momukejorifufipawigenox.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///pitavipobota.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7f55aa495---20159664292.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/kobimuvatozunafo.pdfIn PDF document text
    • http://podushka.by/files/files/99302430167.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_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 18252 bytes
SHA-256: 917cb03148ea3bf6b2c391e47b3643f5f28f388ab3f98f85ef17f2d9e35cdff6
font_01_sfnt_off00011325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11325 10660 bytes
SHA-256: aff26b3680e77b16a076efb8e003a4b93a4b0f4bb8d2fd4e7c24f90d02aaf916
font_02_sfnt_off00012b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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