Malicious PDF — malware analysis report

Static analysis result for SHA-256 1892e588419fb498…

MALICIOUS

PDF

91.7 KB Created: 2021-09-21 15:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9de2d2258e38b21b8c1a1bab4d6a3bed SHA-1: f366851c8c784974c77a4443a9a62642010916ea SHA-256: 1892e588419fb4980fa1d8b7a5f8bbe57c4aa33582b9963673a01b13ff2e8a43
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised CMS uploads and disposable hosting, designed to trick users into downloading further malicious content. Embedded JavaScript streams are also present, likely used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=openstreetmap+android+example PDF link annotation
    • http://eiffelflowersquesnel.com/userfiles/file/gutikirakizikoladovafu.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-14/20210914163547612442.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/wabenavewugopesix.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210912_110837.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/kemaxadumiperapejevi.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/gifematoga.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/35593506927.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/solonolukusejagutadewa.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/tulivupobijenavemigalux.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/bimukutoli.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/32196710955.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/93812859323.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/37922871766.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091206022373499.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161404254d7fa5---jemitiwofuvofojuwitusib.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/wimodasujajidafujonetepo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/55ats104iasipc7m9fri27cen5/jabija.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/55492919177.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/gegizumaralolaw.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/mitakulalalezoxi.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/89305403398.pdfIn PDF document text
    • http://suaups.net/userfiles/file/zupemewexozisiwib.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/xodujigelovinixexo.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/xolubaj.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614001098a13e---36237274982.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_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA8 17404 bytes
SHA-256: 30e05177c8eea9b3eeb3e040f1e68865198281b48f361632d7a1e8eea57a125a
font_02_sfnt_off00014859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14859 10680 bytes
SHA-256: 9453bf94374683f0ede537ba1e3e2834b39a4280c713040068983d2bde610eab

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