Malicious PDF — malware analysis report

Static analysis result for SHA-256 1716bee5e197670e…

MALICIOUS

PDF

93.4 KB Created: 2021-09-04 09:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa049efdc58aa32d5bced7232d391641 SHA-1: b2219af19e555b2a7acae50cf11b0fbe7a27d9f2 SHA-256: 1716bee5e197670e8e0fd6e91cbfa76a4224e3bbfdd9e1aebfec0e0df3ce01ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting it is used for phishing or distributing further malware. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://krisoc.ru/uplcv?utm_term=macro+code+to+loop+through+worksheets PDF link annotation
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3f5cd82e5---52786481216.pdfIn PDF document text
    • http://agrion.org/upload/fichier/rixusaxapajepejis.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16120a1c99b95f---bagusabotis.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/c81893eebc956509e7e26314fe82c414/49297125295.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16111c49cc4a37---fogepukumifipenenot.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1353dc316f---37586516814.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/86136399447.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/27803786950.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/fojumozaz.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/21956601839.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/7031610671.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/1376a2d3ac1e272496d502e50b157a29/winirorivozonitutomiw.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/86147316040.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/cb95d4e32afbb716679469ca4d406133/35595435789.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160889196f058f---wixizofofoduvorelikig.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/76927649549.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/zevojaxinesotuta.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084224c8631c---31342989682.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/busakopatapolufokupip.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc92faf626---71991712438.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607177d5937be---rotuzefumogare.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1ac5bb63b---zoxuvakife.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/xebalamerumej.pdfIn PDF document text
    • http://yepuco.com/uploads/files/27186210286.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_off00010979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12190 10868 bytes
SHA-256: 1744cad06f896133f5a8ed2fe4afa3ef2830b7e6e4946097195b299addd0ed0c
font_02_sfnt_off00013abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABC 17608 bytes
SHA-256: 19ff8605cf0a00ca025f750c9101b68d44ba9dd6df837b37d7befc696ebdff0c

Open this report in the interactive analyzer, or submit your own file for analysis.