Malicious PDF — malware analysis report

Static analysis result for SHA-256 2564b4553d1a0dbf…

MALICIOUS

PDF

87.3 KB Created: 2021-08-04 11:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 215af5f7c984de6b7dfdcfc7a04e6029 SHA-1: 705bf15083d4aac7a8e093815d365f72380283e2 SHA-256: 2564b4553d1a0dbf096aba7cedb20e2f292a8cd9f237de25262fecbfee2a5b23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=microbiome+diet+phase+1+food+list PDF link annotation
    • http://adamlegal.com/userfiles/file/jikonumi.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160874a358c347---36603471996.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/laduwatitedaxavamolub.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/23906019570.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/xidirigokuvobo.pdfIn PDF document text
    • http://pbsdeltarho50events.org/clients/d/dc/dc3fcb918f61c9276c5829b035df2abc/File/42733794214.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/jivuz.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/ffbef4200ccb6cdaa3f455cf2f42b4c1/negag.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d6d1e898---xijavogofube.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/cfcc9f0f5fa3955e34ee61f9f9c2f4db/78242367567.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a035fbda6e1---molekuzisixisanutugaguw.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e975d16941---84101539893.pdfIn PDF document text
    • https://visualarchive.bg/files/bogikijulizeginivime.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/2ce77c12065a25582d3cef179adb5097/zidinujesivigis.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816c355e0ba---6745675429.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/3aea9a6e9e98e0d9c33b8093dc20838d/lasativivezefozi.pdfIn PDF document text
    • https://castel.ro/userfiles/file/16421371174.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/majuketuzogaben.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/tiwixapepiwariboporux.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/57494262079.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/revukijanavaxovime.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dc307eaa3---42233248049.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4a145dfa4---90113099810.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210626235858.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/24548854352.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_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 10964 bytes
SHA-256: 09ed9cc1e27b1141d010ec6611ebe552049664fd3ff1ba73e31828b5b4be105b
font_01_sfnt_off000108e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 17004 bytes
SHA-256: de925b9b30c67f7b0f7aaf20d024192c944d603ceeea9c4525d2e0a5279b65c2
font_02_sfnt_off0001352e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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