Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a26bacb1d10b95…

MALICIOUS

PDF

91.9 KB Created: 2021-09-09 23:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c387d26c61c69876bad494059b55a66b SHA-1: 8d0a171a88e98e19921ba51ca906512e3ae9c64e SHA-256: b6a26bacb1d10b95a04d47949460bdbf598f1e2523e619fbbb25010f2eee6216
196 Risk Score

Malware Insights

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

The file is a PDF document that employs a social engineering tactic to trick users into installing a browser extension or update, a common method for credential theft or malware installation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may leverage JavaScript for malicious actions, potentially leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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.
  • 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://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/70096209915.pdf In PDF document text
    • http://origo.ws/userfiles/file/35469061319.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/h3rr1cq1ulvkla03e9mt0obg6q/tatikitetimufavibobilexil.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/46607297123.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/13432645671.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/kanilelaxepafomexigen.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/22365434651.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/dazovubav.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/kowobavirorur.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/setefapetifijale.pdfIn PDF document text
    • http://maxbrio.kr/files/files/41027279816.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/2109061927473018510xk9p.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/kizevaxu.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/magudokujoj.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/44421099452.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630619860.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/61717884883.pdfIn PDF document text
    • https://brs.jo/userfiles/files/koworatux.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa7e41771b---84752292361.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/kuwesolesaden.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62119088271.pdfIn PDF document text
    • http://packamate.com/userfiles/zomepala.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/51116465481.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/931c3bf19bc195541a2bd5869040c1c8/45755384040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+get+1000+robux+freePDF 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_off000102c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C4 18408 bytes
SHA-256: 06b9e253326890babdae7807dd98988d6ed7384e15c76ba01bcd65fd67e18aac
font_01_sfnt_off0001321f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A36 10408 bytes
SHA-256: 4f354a4648aa67b34978c9857b88ba5ff5c2abd8e3ce579eadf162b6ab0fefe9

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