Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7ec907bdbe1f24…

MALICIOUS

PDF

100.0 KB Created: 2021-09-07 11:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 87b0ba9021157cddc76214dca094ea2b SHA-1: c464cc2805072766a42d2b73a76c6b54c9fb1ac9 SHA-256: 4e7ec907bdbe1f24a84f05faa870caf54d8e60cb2d226975b7981cf61a753182
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple compromised WordPress sites, likely to host malicious files or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The presence of numerous external links on disposable or compromised hosting supports the attack pattern of redirecting users to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/53f58df2db658ed6ce881a623a4e98c0/vavoputuginopefuvopoxuw.pdf In PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210629_8F06FD7DC45E2ABB.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/998665719f14717b02506d077747e730/55711816951.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/jiporemefajobotiga.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079d0ea790ea---rapaxexematije.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/87019322861.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/i55980n67ra571oh8sg5oemfs3/63761595316.pdfIn PDF document text
    • http://poorclarescork.ie/images/63189076698.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/8519751056.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac5e8c16f---waliwa.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/66934938009.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71b2247db7---besidivurupibapedejos.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/nupexajoxifag.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/kizudotinosovaredi.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/990d1271e85f223fd331ec6d7e68e757/wetaradera.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///6139254571.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/10261732990.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd2c12bf62---saxolefejufedudapafemeb.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/p3altgqqrsq1v4n6brvmq4305l/wigizoramiri.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ec47cc4ac---bazepuwisikerisoxowinoj.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a03255b51f4---33975286304.pdfIn PDF document text
    • https://isleo.com/i_photos/file/nejavexuromi.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/5ulpdtgd2bo5fgcp9e23k9lv94/wezimujulipasovabejatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=subjective+refraction+pdfPDF 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_off00011d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13530 19740 bytes
SHA-256: b2656264a422096f4887b921005dba186d3a3a9b273acdab25ce34fa9e34a320
font_02_sfnt_off00016968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16968 10912 bytes
SHA-256: 0c9933c37af442f53600b00fc09e3176117d61abd79ae432815f7b1120462e19

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