Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f310b1e343bbffa…

MALICIOUS

PDF

75.7 KB Created: 2021-09-03 14:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e2ac545d951b17b1542d497d0039eea SHA-1: a2a4e74e807d3ef8c4500494e26a97c1b9ded639 SHA-256: 3f310b1e343bbffa83c87f933fd6803b7082cf6564f76a686692f5bb97f02e1b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/7c2f6728f7d8ab42637c525ab91474d3/21023272930.pdf In PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608883818cd39---60961457882.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87207868690.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/89346523853.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/zumokikozisusel.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/46671155221.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/dosejukozogilufodupiviw.pdfIn PDF document text
    • http://synphabase.ch/upload/file/motapox.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/581ef2ff431c974911e74b3d20585450/mokokekuvun.pdfIn PDF document text
    • http://apcmagon.com/userfiles/nudulafune.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210822_607AED2720009B37.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/ftcd0ks05evvf7h1f321ljgu05/87227435173.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/5471201223.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608fefe7a9e3a---14288869094.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/2293916078.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/liwite.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/91981355169.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/konirawadaluvimiwal.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/selajazobibepuv.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b13c1acdb2---nolawumekiwibopovu.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/8aaf3d4f79ac104490fdfdf14f26494d/nadubitinat.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/b475aa6aa59377ada83cf7d28ada5720/daxedilalufoxifup.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/cca734c98f6c6fe6a42ab973f901a352/lozuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sweet+child+of+mine+solo+tab+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_off0000c278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC278 11084 bytes
SHA-256: cbba95aecbbd3e7ac924124601a18caaaa810cca45a3a68c258e564947db624e
font_01_sfnt_off0000dbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBED 17264 bytes
SHA-256: 3d0814762164f6c4160f58a4b1b301f797af281fb8cd027badcf057f4489e2ab
font_02_sfnt_off000108dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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