Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4af84a34f891a3…

MALICIOUS

PDF

68.1 KB Created: 2021-10-01 20:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2de5ff06c2f0719a1456070deb6d4708 SHA-1: 1d224548d157845debfe36de5c6f384119b86b50 SHA-256: 9a4af84a34f891a3f307a384efa3f1eb3e38e1b1b4815f32926de8ec8358bde2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple compromised websites, a common tactic for distributing malicious payloads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://ms-krmelin.cz/app/webroot/files/files/lepebonejebozi.pdf In PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/jikosamune.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/86027792226.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/tdke8ie9lripai3e3kdjssvu2r/12697149550.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/17964789082.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/tixajupigokugudefubodipof.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/sunubibawiwixu.pdfIn PDF document text
    • http://vaithun.net/upload/files/67857527739.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/56f8d4609c0f9bc3935ba984ef6d83da/kufanonulenujodonafofa.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/mifizowolegazoworuka.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/53188212570.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/t7n8urgv5j0c5lh275p4eegrfc/kumigiw.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/99592540367.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/dukeranuxowiromuv.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/77607310288.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/6790241173.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613755e034e97---80203988004.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/91532404493.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/turinunonutokixox.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/2755360423.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/34118203840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=free+fortnite+rare+skinPDF 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_off0000b016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82D 10228 bytes
SHA-256: f68ea9843a1b8c29f5b2aee0ad88673bc18a732b573867a0b3972858cd8041fc
font_02_sfnt_off0000df45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF45 14332 bytes
SHA-256: eade7ab3eee0012fd596a721f66171cb8528c08ead02086a2f62393379e27a96

Open this report in the interactive analyzer, or submit your own file for analysis.