Malicious PDF — malware analysis report

Static analysis result for SHA-256 5827cecc2bfc9d2a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 06:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b9e2514eab0ecaecf3c65f8b78b994df SHA-1: 216d64ad133b436f4968b71741619a1b1ca37e89 SHA-256: 5827cecc2bfc9d2af01cdb3da6af18eb71dd90c9ea3ab60f224dddfec5535f8d
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=drift+hunters+unblocked+top+speed PDF link annotation
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/malir.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614232f6d01ca---suwefuv.pdfIn PDF document text
    • http://01host.ru/userfiles/files/50925648097.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/nowopewozi.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/15651925803.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/wegivirirejoxemowimarabe.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/dupotolidoxevazono.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/16966302397.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/mimena.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/xatusebuxejava.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/zixopodaluroxibesebajo.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/9602932332.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/supulabibaremin.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/gukororibesuxuzire.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/sunhmvk6vbb1jd3epb3ut4brp9/26216431030.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/81931176160.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b039251b5d---52487136313.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/2pq1nchvcrc8f9lt9bfad2gded/xuvakevokon.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///77738582980.pdfIn PDF document text
    • http://sushibelovo.ru/files/32206355533.pdfIn PDF document text
    • http://kodemari.info/data/files/33397338232.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/girototajika.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/zetafar.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109070647246681.pdfIn PDF document text
    • https://ksboutlet.com/file/files/xezepavitufurozagoluvof.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_off0000d8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CB 17036 bytes
SHA-256: 2d4d9e4b3b88ecf8f0c09b8546b2182993818003ef2534ae5d0e518395534cbf
font_01_sfnt_off0001052f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052F 10888 bytes
SHA-256: 3c321cabf788a953d29942e8f545296bef60cd7bbeb6ee1c720638391d40cbdb
font_02_sfnt_off00011e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1