Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c57c04b6656ba6a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 14:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c5576cf47223a8766404be90dafccc65 SHA-1: ed02a5d65c24c3c580094fa0d631ab123c633f82 SHA-256: 6c57c04b6656ba6a92a1cb0c2d9d213e064f7806c8eb0d4aacebc00806a6dba6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcbb96edae---fujiso.pdf In PDF document text
    • http://elijasprojekts.lv/files/file/lefawufoxilajokenevade.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/reraro.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/govibijiporo.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63e4d4841b---kuwuxupinexoxugibijijukem.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/jusisete.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/gixatemosatotosopujemusa.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/murarawikixenaxip.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bacfa095c9b---82037335437.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161238d3d3b193---dejilesideseba.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/xifakurexenirepelumofivev.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/nigulosilawugalunegefoxij.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cd16cdd9f---goforolapegu.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/7212613487.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/31791116812.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd9b99f944---jegolejeragujezobim.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/66232839032.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/47325080577.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/jojobis.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3b7b7d3a51b4179f267913b926d10da8/85077997529.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-08-22/images/files/giriputuzabifadorajijanu.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/69fd30e468a4d797699163d149d6a8f4/9704949264.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/8qtlvutvlcicd0l5h1j7nt3si8/kekelupeganebisidoweso.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/c6e4b2e5dc99ab3fe6c812bc34d057fe/gusezaruzosaroz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ignou+bcom+assignment+2018-19+solved+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_off0000d866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD866 11824 bytes
SHA-256: ff1d7cc9582b27836b29ac076dfbd574144e47ca5180ef87a4a4f750876d9d54
font_01_sfnt_off0000f478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8A 17476 bytes
SHA-256: aeccdbdaa336a97e323f5e184747595a197bd1f58119622d039ce13a9b53624f

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