Malicious PDF — malware analysis report

Static analysis result for SHA-256 db690288ec1032fc…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 11:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c4cababa01038addb4981c9ddc8988b5 SHA-1: d75d524b81a43edfe1ca58c6c384333befe81a25 SHA-256: db690288ec1032fc17e6c6cd085552ab6325c31585a0237d77c6c0573f5d4247
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting sites, a common tactic for phishing and malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a technique used to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://inwebjor.ru/uplcv?utm_term=disable+safe+mode+android PDF link annotation
    • http://darangyi.com/userData/board/file/22872301054.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/14812106820.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a3869f6f6b5153e6f24b37b20a2df981/roxijozunuxabuzatoki.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/80442077772.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142ce2834377---gerujowofapajibusi.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613832ed6baa3---widizekojitede.pdfIn PDF document text
    • http://ruihuitax.com/files/file/butawerisevenabitavef.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11020761847.pdfIn PDF document text
    • https://gdaniec.com/upload/files/77148357636.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/2237949812.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/66753386889.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/73677470568.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/33715470373.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/vefizapawoxuranir.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/favex.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c950e279b---gopiwilasefofivegog.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/98036177574.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/44492602926.pdfIn PDF document text
    • http://ctm.it/userfiles/file/22567668744.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/34167290794.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/xegefigoxidi.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/jiwezo.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210908190126.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_off0000d8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 18048 bytes
SHA-256: 6a0690fb0ecb58bb595c1266045712a5d6e3ba4fb63fceccd66f178d58407d1b
font_02_sfnt_off00011fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAB 10556 bytes
SHA-256: 7e0a360d72ded2d762fcac9d4a2f8ad2f27a2cd1f90157cde80347a0070a682d

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