Malicious PDF — malware analysis report

Static analysis result for SHA-256 e846893562e7aca9…

MALICIOUS

PDF

87.3 KB Created: 2021-07-14 00:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5e2269fba3254dc721e8ad3167b37c7a SHA-1: 0b42b4bca629b8661f002f25299a8388f7e41138 SHA-256: e846893562e7aca9caf3344099243350026b461cc6ff5fc3efd9d4adecfc2820
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document likely instructs the user to install or connect with a remote-support tool, a common tactic for gaining unauthorized access. The presence of numerous links to compromised CMS upload storage and disposable hosting suggests a link farm designed to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a735561cdc---gadagitarokaj.pdf In PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/25205874744.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/zufubudamapujaj.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/137e9b2fbbfb2d2b4192b5bf543ea05d/varusuvikidowij.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/vobelutivana.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/vc9uuu150grq4h0doq430vohnn/62238554130.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/6191bf91747689fc91a9a12b0d586c1c/xapoxixumulukuw.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606faee481791---zoperatatixozap.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/94900da9764e0c9f1c23f407a69a7fa6/mebinowedabidi.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/30554565150.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/7dbd12f203f871d28bc044a701400eb6/5218073861.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/89985400685.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/89177882536.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/42144732399.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd82a4fcc2---badavatalezap.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/nazukidekesapobogiv.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///58689452078.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210705012433.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1625591285.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a279269be21---gavefaj.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/jetetomabirusula.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/rasusefivofezoz.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/gazotufujemavi.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe97cc193b---savapuzakivimerusiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=adopting+a+guide+dog+rejectPDF 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_off0000f456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF456 16604 bytes
SHA-256: bd5b11e380acd65bc248b66d459862db3b81b728c2aa1b63a26f1cd084eaafab
font_01_sfnt_off00011f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13787 10688 bytes
SHA-256: c4db639bf908862bbcf80e820084ca7ef750c56647b1c2c1314a340fbb2b1d34

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