Malicious PDF — malware analysis report

Static analysis result for SHA-256 083b3d425519232f…

MALICIOUS

PDF

78.6 KB Created: 2021-09-09 11:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 739696267c78e4958fd191f62ab90fca SHA-1: c1f1ed64776bd1a93999b0a8f31afd0d1f4b272c SHA-256: 083b3d425519232fea35d4e120fd8bb50157ed1217c11fc01817549f9de0a5ca
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/41e4073a8d5fa8816e1d8d350fab7998/63740812355.pdf In PDF document text
    • http://buren-kompanie.de/userfiles/files/22403865685.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/mivuf.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/papipozusopifutodeza.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/28031906756.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133b4ecbb12b---21795018010.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/wukiwepofabukaku.pdfIn PDF document text
    • http://anpharma.net/upload/files/kunozuwibagojitululo.pdfIn PDF document text
    • https://steammining.com/userfiles/file/78226615407.pdfIn PDF document text
    • http://pk.mo/userfiles/file/82858378112.pdfIn PDF document text
    • https://braus.uz/images/shared/file/golumivosuvera.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/98223538365.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/losutikinula.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/876481111.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/gonuraji.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/bafaluvedosuvipone.pdfIn PDF document text
    • http://tzsunup.com/upload/86879487705.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161358b9f70111---56564276807.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/15508733829.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/242066413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=super+smash+flash+2+v8PDF 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_off0000ce3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3E 17824 bytes
SHA-256: 1df7ef45a9f8d55fd6485e159d805234705e524dcbe257cc81134580b44bdfc3
font_01_sfnt_off0000fc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5E 10780 bytes
SHA-256: 466e4d1460e590a1a442b279b598aa6134004a7109a4734b8f4c1b89fb2028e0
font_02_sfnt_off00011543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1