Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b29abb51812082…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 12:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 282390c55448cb350dd528b48ff52533 SHA-1: 8f6283996d65cbc0cb875c2446d4f31df28393bb SHA-256: 90b29abb51812082cdd5e207356667b6f44cef0aa56473547cdf7b148694c9ec
204 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content is designed to trick users into installing software, a common tactic for malware delivery. The embedded JavaScript likely facilitates this by interacting with external links, potentially downloading and executing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613708804e7cd---70980947088.pdf In PDF document text
    • http://abwingsjanaf.com/uploads/files/mepupigunavevetabitugi.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/13054974140.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/9250d5b898ebe7fef8f320b9acb4b333/72090555174.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/nipot.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/jujaxudolutefaxopetibux.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/79324666164.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/77658684109.pdfIn PDF document text
    • https://cian.hr/userfiles/file/59077339877.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/rorerix.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/41908086468.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133b6bdc8415---jaxonizelujozi.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/volatelasojufi.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/vavivoxuwenepono.pdfIn PDF document text
    • http://rilta.net/userfiles/files/60689378079.pdfIn PDF document text
    • http://it-hair.com/userfiles/sojave.pdfIn PDF document text
    • http://klhl.com/userfiles/file/20364201715.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/18632952590.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/32453539991.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/fixabixalodisozepopelilux.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/25593318730.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/sazupifupawowotozaxaj.pdfIn PDF document text
    • https://la-klamm.org/Files/files/ratapuguw.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/30664701440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+install+chrome+in+firestickPDF 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_off0000dd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 10772 bytes
SHA-256: ab148a03795244a211188c7767b3fd0641be4612cb31b29cc1f7581d7a3fe3dc
font_02_sfnt_off00010ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDD 17988 bytes
SHA-256: e3b112630adf651f74f8537a678a1cbf226e78f22054680be5236aea5e3feed0

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