Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c86bc3937f18c97…

MALICIOUS

PDF

97.3 KB Created: 2021-08-15 01:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 0a21a59650d6630cd6b9bd10b405390d SHA-1: cb86bb578ed63e29c26535244e6214201e5c35fa SHA-256: 6c86bc3937f18c97ab23f9590713d146597d0733bc43da3732cfeab7b76b4cec
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress upload storage. The ML classifier and ClamAV also identified it as malicious. The presence of numerous links to potentially malicious PDF files suggests an attempt to distribute malware or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16087901238167---vipowekewuwimubu.pdf In PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/43920309315.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/fitaw.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/papafemafalalosekij.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/t8bkq1oqfp7bd8stnjn7v2c0dl/wukusujegefunid.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/ganasupusuxufoke.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/59505730166.pdfIn PDF document text
    • http://wamer.org/userfiles/file/sofadus.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787e28c65fa---rulewur.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/32168170322.pdfIn PDF document text
    • http://idcla.net/upload/files/fijanisujanelalirujemaven.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160924c938abd1---52952887293.pdfIn PDF document text
    • https://avvocatoboretti.it/file/58224327925.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/24617511789.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/14030943038.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/sakmbntosqrm4ec5bind7d7brb/88279097517.pdfIn PDF document text
    • https://campermagazine.tv/public/file/17143931145.pdfIn PDF document text
    • http://plastikacz.cz/soubory/files/50402329515.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/rasozoti.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/17260965524.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b48ad854bf064c477f646fc5947a120/64744338547.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/pidozilis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=auto+pet+treat+dispenserPDF 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_off000118a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A3 10420 bytes
SHA-256: cefce395103dc59e68e6f3af22389b0ca008809280b2fbbb38b7aa5d44b8d88b
font_01_sfnt_off00013065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13065 17564 bytes
SHA-256: d6ffe69af76dac74d7d6c926b1cc546e8d4844e11e1909a1f1a57b2a2d8d4fda
font_02_sfnt_off00015e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1