Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2536b1bc7bba8bf…

MALICIOUS

PDF

84.2 KB Created: 2021-09-08 15:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7ecd5ac0582cba6072635be846e45625 SHA-1: bf0828d169813c43cd11340195cd6159f285a7fa SHA-256: b2536b1bc7bba8bf7716ac52b5f3e30570d5e20c76fdca75b53ba97b46a0cf4a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. ClamAV detection and ML classification confirm its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://garglob.ru/uplcv?utm_term=manual+die+cutting+machine+from+china PDF link annotation
    • http://smart-ventures.ch/upload/Editor_Images/files/19802095415.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131cff42ce6c---23119100237.pdfIn PDF document text
    • https://mimpishio.com/contents/files/figekufonenogepig.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/1747486910.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/24649343067.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/23549429554.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/lubazifonatakivikagidoto.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/rezagux.pdfIn PDF document text
    • https://yuktogel.com/contents/files/79124568900.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/jijinow.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/48773390077.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/bilibodoxipive.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/dalobokipobapulazi.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/88249159792.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/17769869929.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/35285386549.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/99971296507.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/41476577964.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/40852821278.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6a8785eeb62e17601a24f550e2964e62/zedanakexi.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613485101f74e---gomununagagogenonojupam.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/domatavi.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/56783881327.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/44177694747.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/58475726297.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_off0000dda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA7 10848 bytes
SHA-256: 18e0a977785819ef910fceb5c84913eac7bcf920916a67f2bdf7423b23897380
font_01_sfnt_off0000f62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62F 20016 bytes
SHA-256: 7d652460d853300877d1208d823b1d4a79f2cf8afdf323e36a54b0481f351bfe
font_02_sfnt_off00012af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1