Malicious PDF — malware analysis report

Static analysis result for SHA-256 93481cba3c36fa56…

MALICIOUS

PDF

85.6 KB Created: 2021-07-22 13:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 1c9e1dea4ac6e96f4f7bc1b7b535a7ca SHA-1: 1c54bda8065dc7970b4ab6237311f63c97b73fe3 SHA-256: 93481cba3c36fa56f2e33daf64acbd815ff446e695a7829d6d2cd3a810a4d4d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. This behaviour is indicative of a link farm, often used for SEO manipulation or to host phishing content. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ckm-machinery.com/userfiles/files/7625806975.pdf In PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/358f493583bf4d489647147fbff9aa8c/66891215370.pdfIn PDF document text
    • http://www.asslar.de/downloads/98899194403.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/d2da5b4227082b82e7b421854c629cc9/53362739457.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/23041107532.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/47842b826b6e4bdf5152600a4392b344/vekenirobeg.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073c804ca5d0---tebelixidutuvugegazer.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/mugumivelawufumorexoxe.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/0fktphneplhvo6vp4mjpusbu3l/vowunob.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/latavafuru.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5a555dda52---98779151855.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ugdfkb38m2on4vqt87n21v2e04/lofegasiratajevene.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/b1cb927fbb2a2746fe2a4f5d613a5a14/xesapoxixitikum.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/bb51a1fc5bfa2fe5f525130b28d6b663/33732098046.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/d8o7hveptd7jl3ibtbqvbca9bf/pisoxunogobegotelal.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7dac71b73---75210394774.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/93202168548.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d7381df4ab13b7be53c83fcc6287b3b9/54858279766.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210620_64B87EF76ADC8A73.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/65206541113.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/vadexupopuxek.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/0124fe0ca9e6773223a3b705819fac1a/86078452077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=price+of+american+bully+puppyPDF 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_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10175 10728 bytes
SHA-256: 0486b9d1e2a168313c71922d0f925160ec777d1cc3d4f91fce82890d5baf7073
font_02_sfnt_off000119d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D6 17412 bytes
SHA-256: 4c10427ce877ef5cf6a155bea299dfa4985602a55f1e759cd9cdd127b8d51e2f

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