Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1e05f1e61c0234…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 16:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c5cc7c40f3e781e98ccd061c64daeab5 SHA-1: fe5a12226c6bd6e188e575bf1ff7cc1a823e6dbe SHA-256: bf1e05f1e61c0234c907cfdca3e82eafbfdac4305354401fa2441be87b01116d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as a phishing trojan and the ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, directing users to various external URLs, some hosted on compromised CMS platforms. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ketchas.ru/uplcv?utm_term=reading+worksheets+for+2nd+grade+pdf PDF link annotation
    • http://telegid.tv/userfiles/file/83077123283.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/78845663955.pdfIn PDF document text
    • https://mmszke.hu/files/file/dagupigarivabepan.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/92122577016.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/porofug.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/84287287839.pdfIn PDF document text
    • http://cissi.it/userfiles/files/bofozakobajap.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf6a28b80---zobilusenimuxojata.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/33sguj5451u6i6j2b68djpp0m5/99717533330.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/buduzagapux.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///69160126177.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/xegevosapanenosemaxoz.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/90004669303.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/48717862181.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/tuvejefovadetenubana.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/4e07407c30e40b642487c51835b7e9a5/nuxakuwajijegisa.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/gejomunotasotefe.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/22723171666.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/52853824543.pdfIn PDF document text
    • http://asja.ua/userfiles/file/wojamewawokar.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/40521060896.pdfIn PDF document text
    • http://jn-zhsc.com/upload/larojurekotivexumoxeput.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/15108726108.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161387d5ef3c7a---jibosudevozunibobarap.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/mitakigexo.pdfIn PDF document text
    • https://go2germany.ru/files/file/fewotoza.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_off0000db85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB85 17476 bytes
SHA-256: e069943f56e0a94ec21deeaf51e86ba9acd265bfdc9317da1dd15c4a28a879e9
font_01_sfnt_off000108fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FD 11072 bytes
SHA-256: 7d0c0f780b162788d8a202c3029e9d5e9bfe964ef319d6082ede17332b999ad4
font_02_sfnt_off000122a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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