Malicious PDF — malware analysis report

Static analysis result for SHA-256 56cd99eeb75bf4fb…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 23:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 812dddc66e0032b3be65a0176e7e414b SHA-1: 958dd872f11e7395db42149cd6d8da6352a31e68 SHA-256: 56cd99eeb75bf4fbf6ef73a9a49abf68f2c6744c33d14c1e2b9f59e900c5ffdd
196 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to download files from various compromised or disposable hosting sites. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's intent is to trick the user into installing a fake browser update or extension, which is a common social engineering tactic to facilitate malware installation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://marjoyunlar.com/calisma2/files/uploads/vojuben.pdf In PDF document text
    • http://yugreat.com/filespath/files/20210906202313.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/dokunejas.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210915_202326.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/89476219221.pdfIn PDF document text
    • http://cpviettin.com/upload/files/sevidameto.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/walawamelujetovepa.pdfIn PDF document text
    • http://termocity.by/pics/files/43718573934.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161353e948f5e2---83519038781.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/82882523833.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/sexadire.pdfIn PDF document text
    • http://www.centralperdana.com/file/tuxararatupetopovutaf.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613356b6d811d---21170583174.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/63211567867.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc564e8ab5---mavugisujojifez.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/2912099000.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161404ad609c95---14919949913.pdfIn PDF document text
    • http://floramarble.com/uploads/17688089769.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/90917854659.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/22563876872.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613029f89766d---niduronuzaf.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/suwujanimoropato.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210904_02C5CAB5358CC72C.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/mufoximav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=download+windows+10+home+single+language+64+bitPDF 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_off0000d24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 17588 bytes
SHA-256: df246e8a036a3d13e06e3c9e3015a5717864fc02647bba74175a285445e1d4f8
font_02_sfnt_off000117b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B9 11344 bytes
SHA-256: f869d8a6c324d3e94515a4f0020f90bd10b7cd3d96cd35a43cedd7a66bd49aa5

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