Malicious PDF — malware analysis report

Static analysis result for SHA-256 75eb8ce6df4a9da9…

MALICIOUS

PDF

157.0 KB Created: 2021-07-05 05:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b7d54bdde29f7e05d3160c665f038b85 SHA-1: 305771d6981916f911198dc94c60e9405f6a31ca SHA-256: 75eb8ce6df4a9da9b1be64ef8bf85bd80377efba1732db3ceb12983d0c90c61e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's designed to host and distribute malicious files. The presence of a 'download button' lure further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • 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://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608904cf9a065---58661626033.pdf In PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c43140c8d2---8519616766.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0ltuk6g5g2le62m8rinjuldh0/vivirozugagogevefali.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/kusimugerulodudafu.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/77108315561.pdfIn PDF document text
    • https://85097781.com/upload/files/femiziputulutizaxavu.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/roxejusujorobixapejotox.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/74387980948.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/57807755563.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/lonazafosusovoxemusages.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/314b543297f41cf6df4817b9e5114c6a/rogedakaz.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/c182b072b11880005f890d30919325c4/naneten.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867e9a3178c---biwudiritovaxexafoxudor.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609410fda7dbe---jawokixanemopapetupi.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vadobetawabesoxote.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/60219502964.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/bepajararuwep.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c8d61f38f---6663863108.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7c7e8aa792babe0be18173876043caeb/pejunolujiper.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086356023918---gufetozurawabixativoluze.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/dbbo6v4gnndiuih8qti1qqm8o5/tiforilo.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/97309854762.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/94115573839.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/bekusozin.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/13208704391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=definition+of+orographicPDF 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_off00020629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00021e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21E40 10544 bytes
SHA-256: 9b2082aa1f72a34cff0bef1330f898998c241f95c4f59f40bbc622e3b4f4bec1
font_02_sfnt_off0002363c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2363C 18308 bytes
SHA-256: 763d8b869d7aea3daad1e6b0089b31794f92ccd5d8c6c6bccf31cb5126053d07

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