Malicious PDF — malware analysis report

Static analysis result for SHA-256 b940947f2ab467f6…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 04:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8a9a42bc58b6e6c8be15cc873d05a5c SHA-1: 8ce1b40cfb67d6eef6260feea40336484c887397 SHA-256: b940947f2ab467f633a43bfb04cb71ba3d202e56c24089cd9c5a3558bb14ead4
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to trick users into downloading further malware. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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 http://schokozentrale.de/idata/36413544124.pdf In PDF document text
    • http://gyogytornasz.hu/editor_up/delewawewanal.pdfIn PDF document text
    • https://makenie.com/upload/files/65611403985.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/94786745460.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/88054128010.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/pozanamol.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/gccpuv2au2m68uodrvdlbpk0l7/majif.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/18109255334.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/wejegegavelaruna.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/59481bc89aef59eb642ad029c81bd8de/60454541426.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/98249160629.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/73174345714.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/fabivimuwasevonogopubode.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/55130612652.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/36499237185.pdfIn PDF document text
    • https://invision.buzyhub.com/files/64342327087.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/51381616453.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/84778457161.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467cc1bd857---10138945913.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/83371408407.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/tupawarosulitowuribid.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfa8a1dad7---bezubigapitos.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/levilamoz.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/52274809990.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/92227174513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=download+resident+evil+4+android+fullPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/lalivux.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_off0000d2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D9 10680 bytes
SHA-256: 43014600ca55f9ece56fee64b7b1b9e571d49907a936c4a5e08fcedab24ef80f
font_01_sfnt_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A5 18036 bytes
SHA-256: e44f48c305c5851bba7534fb625f7d27d221347e40dd618963b127953d7125d1

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