Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e1bd6a324dff428…

MALICIOUS

PDF

74.0 KB Created: 2021-07-02 18:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fed5a9b310bad5e6a42518857ddd7983 SHA-1: 871256b71315e89b3cd33c932c824662d5a65049 SHA-256: 1e1bd6a324dff4289d569845a4e240c7cf152da2e6c50aadfe3e1cf13235485a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, containing numerous URLs that point to websites, many of which are hosted on compromised WordPress installations. The presence of a 'download' button lure suggests an attempt to trick users into clicking these links. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://kystop.com/wp-content/plugins/super-forms/uploads/php/files/36oa8b7iq2rr6or92d2uroqhl2/42576667596.pdf In PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/bt8nit6f63rl8tqqjc0dd9c4p5/23936486327.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/rivinatojuwazefug.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/xiledu.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b835826ebc9---bifizavajudaxemimuzegup.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/e35a6384a96087c25e47f11a1d91d7fc/vexinusofafixaroxizazav.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/72104cba4603c69ca54bbd37d3f88341/12997130815.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/zenezarogetedu.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/b794afb15ad4a0901d5693e800b6af2e/wunenuwozis.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/kugif.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/131b98a02d1cce750c4ae12941cf4896/xabewakukivonexixexufatu.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/tinosojuwodovokubododi.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efdc766c86---tisuroworetamozowebuzelol.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/12185762373.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/12018146141.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/jowubajomowuwitifowunuw.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/jesez.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/51608262957.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d36a279be7---fabebenuku.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/uia8b487oqvcabq74mo35r75i7/didajajitomujarex.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/50833256591.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085843a10878---feminerofofokumilob.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ee556327e07bce9fec104cc9b7e0e576/51216121392.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/kt6pr4fgl69tb68dlrvu34pg2f/biwowugufit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=one+block+skyblock+download+for+androidPDF 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_off0000be62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE62 16488 bytes
SHA-256: 9ce86bd20294fb6bd55326faf51818f57f65251bc3bc17ff1096c4cebd2af325
font_01_sfnt_off0000e901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10118 10828 bytes
SHA-256: 994b06b4240297ff78ca55158e80f01df25da856c110e1d8491c76087ba4f206

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