Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b33a7537d449820…

MALICIOUS

PDF

101.5 KB Created: 2021-09-06 07:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc2b727007042c9d9dd9044b6090e788 SHA-1: c119fae50a216041ff333fc80fadb537a336db60 SHA-256: 5b33a7537d449820da3e610f7d0cc97419099c03e68079e518b9b65dc4ee8df2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to potentially compromised or disposable hosting. The presence of JavaScript indicates an attempt to execute code, likely to redirect the user or download a secondary payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious intent to use the document for SEO poisoning or to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kusadasidentalclinic.com/img/userfiles/files/59082229480.pdf In PDF document text
    • http://m-s-g.ru/userfiles/files/38637841858.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771f5d427f5---33079998666.pdfIn PDF document text
    • https://aitalk.vn/upload/files/futiteruzotevijijizuxewos.pdfIn PDF document text
    • http://ikoi-es.club/yamituki-n/uploads/files/tuvixazom.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/wevores.pdfIn PDF document text
    • http://shield-in.com/userfiles/files/35561774468.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/lozelozokigititugifere.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/54e26062e7d8e352c87d29e1ba23b8bc/zulejakaremexoduvimasen.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca34c2b559---damirenelifunakivitu.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/9vqc6di18s7er9fd6aqsge8qcj/39621555713.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b940a08bf---medokojabozuzaritefabonow.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/7motcai3luhrv6jqa6jt2k2vmk/tanukaveduwejozil.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/52352146600.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210526085308835051yd0bfb.pdfIn PDF document text
    • http://guowangcable.com/d/files/460246467.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/43322899900.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/1314afc971d447540f87be5d418a5ce2/banar.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/97512306394.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/20415219608.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606df4458d1d4---buwenulozam.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/sedugobedejul.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/fb2f1064c37096168f9928ff3a30912e/detopololikikefonefen.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/guwedugamoridiponubowa.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/sopexatuzarabezilif.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/4e4eaae63490c15f8d38b0501e167d4a/xejawewetuloforozun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=definition+gestion+parc+informatique+pdfPDF 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_off0001220e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A20 20644 bytes
SHA-256: afe126f9d9c78ccb839ebba05f46e19f5957dda374e3e2b102ac0381aa78d0b9
font_02_sfnt_off00016e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E55 11164 bytes
SHA-256: 61df966596f373c217e17eee965f1e4ab97ca061cad4fa1f046f1a874bda64df

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