Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1de6b9b1f021665…

MALICIOUS

PDF

76.2 KB Created: 2021-09-04 07:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 928fd47b97aed078aa9ee792af84c075 SHA-1: 980309364bb0ad44115ee5a0e6e7f16efe9b0925 SHA-256: c1de6b9b1f0216659da67aef3b2ac40067d6d83fe02fa23edfbd8221c0c338b0
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The `wkhtmltopdf` authoring application is noted, but the primary malicious activity appears to be the redirection via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://1976ahhs.com/clients/32223/File/30777510859.pdf In PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/kimepilesiwemapodibujiduz.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/475041dc9ff146f6b22ea2f2407e0bd4/xamiwetak.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609569620f0ea---basimek.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/0788766ea229e5555f9d1982b1242b7a/69624616248.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/bazexexidimaxomajik.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/luvogamo.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/xijuwat.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/dapidufutanila.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/53178526669.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/53567699546.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/127ceb4dee3d55717408d17f9dc04610/32708752109.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611796088a4d4---wilewedo.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/luluvu.pdfIn PDF document text
    • https://baongochoa.com/upload/file/9891611349.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/oc2ju96tuor4v11l1no2idl27u/seberetimexusobidupuwa.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/daxeseganodomoguxefemuxo.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210730065256.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/49432200054.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/lorobuw.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/nogodisefemonubi.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/kelebikumebasujet.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/sutebukon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=2012+mercedes+ml350+owners+manual+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c67f95fa85abe542c5577deae4d4fc24/lixatuzadoru.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_off0000c304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1B 11280 bytes
SHA-256: 556d84a735778d4888be78f6609c6d1c414c83613d94cfbb4d1a9e50adbb21ee
font_02_sfnt_off0000f5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 17476 bytes
SHA-256: 377c13704a46c196f2c5a6c3ef9c3a6eee6b4cbed204d01fcf2351875ac6bd45

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