Malicious PDF — malware analysis report

Static analysis result for SHA-256 670bdf40a4f7f957…

MALICIOUS

PDF

78.7 KB Created: 2021-10-05 09:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c78f6afbd43ff4155de921238be44e5d SHA-1: 6d09af20a6e26986e24d49da84af70c2b9d8b4de SHA-256: 670bdf40a4f7f95780483d925c74afa08f3ee10ae6a36e2b113a7773e487afaa
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable binary data, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://eletvital.hu/uploads/files/71603670521.pdf In PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16146562c9c657---javedotixen.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/siloxurasepakiwapikib.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/82640277905.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/37980840219.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/95251444343.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16149e04cb8730---38528811058.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/13610861776.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/38120674892.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/golutilupusivafufipagan.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/67722310397.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/63109493047.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/sikedaka.pdfIn PDF document text
    • http://hasyo.net/files/file/wixejelo.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/taranagabuwasetane.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/jidurifogodizovejof.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614161c92e00e---33431644771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=screw+your+courage+to+the+sticking+place+macbethPDF 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_off0000cc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 18436 bytes
SHA-256: 928c79ed373a33d206f2bef0d991bc8bb98d2c400ed2f04cfcc5b4afba943a2d
font_02_sfnt_off000112ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EA 11428 bytes
SHA-256: 622bd24239fcf7bdd63dea5b22bee1b0902b46956ab6ecf482ad466aee596699

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