Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a549f2983c9f07…

MALICIOUS

PDF

87.3 KB Created: 2021-07-04 05:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cf4776f7bdb2b9e7eaa6ef6eca16800a SHA-1: d6860feccda5f9ff8e17ad43f288c18143d4c298 SHA-256: 83a549f2983c9f075e6139b88e6f367d43b8a9c1c34d5ccdc5e750d0f96eb070
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a remote-support tool lure and a link farm pointing to compromised WordPress sites. The document's structure and embedded URLs suggest it is designed to trick users into downloading or interacting with potentially malicious remote support software. The ClamAV detection further solidifies its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607421efb86db---24658815149.pdf In PDF document text
    • http://sxcec.org/userfiles/file/kakinuxolog.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/8a0a812379cf7a9a115a9f8bdcbd692b/52268264451.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b074b0a44---26474609722.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/filimonizebe.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/mtr3vdmdfu05i5a5e9a53jqhal/vexor.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/sowilegotubazurotubo.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/8cb2e8107eb0572f94fb92b83382cd97/28670224448.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/dununejafa.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/lemuvuwoxevivunaxutibisum.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/0ns1j5i1fupmbj9ltfudqo211a/bamofolobug.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073848466c03---6117733727.pdfIn PDF document text
    • http://uhli-janmaria.cz/userfiles/file/radovuxufeva.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607401ba625bf---godepasopupowutado.pdfIn PDF document text
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/63935689732.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb2c76e2fb---41876221859.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f794c8e549666ec2a5f3b2b83cf100cc/kebefujozokidugiju.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/36a2077d5d4b1268fce75fd17ea12411/8467868746.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/fojumibesesefiledexorawos.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/91e43420d1121a0656858b01e8054dc7/bozosivox.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/dilazidunuwanifog.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/zakipotaxo.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083b9c997533---5589753841.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/51930538700.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/29a279660a81d1ba8aaa59856aff55bc/vusumilamafoxilijajogegog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=download+sims+mobile+for+androidPDF 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_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 17104 bytes
SHA-256: 1f6a4dc79722d9d8639b52d05c7597ba566200a2c92c5cd78da23839c7f7a77e
font_01_sfnt_off00011f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6E 10644 bytes
SHA-256: 30780568a9d689fee88280c4b79007c28486719c2035cedcd1c33aa506bbaceb
font_02_sfnt_off000137ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1