Malicious PDF — malware analysis report

Static analysis result for SHA-256 085d6c096fd10a3b…

MALICIOUS

PDF

86.5 KB Created: 2021-06-26 01:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fc0431f40d709fd29e7d2a0d8768caf7 SHA-1: 7c2fa7eef89623c4387887623f7b2a7d5dbc957d SHA-256: 085d6c096fd10a3b155dc9fafe98e078ee72ec3573df653a6f556ed7c145dd8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, designed to trick users into downloading further malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to deliver a second-stage payload, likely through a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://allytemp.ru/uplcv?utm_term=windows+activation+key+for+windows+10+pro PDF link annotation
    • https://zanhotel.ro/beficientconsultingFiles/file/28059943879.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/cb5dbc18dc721cde6358dcf30dfc754a/1936164313.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608386c362720---21503354662.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/mepigesevibesoguz.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/18538560171.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3547ab050f---jegutebogonivipodujuxif.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/27726901764.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1342fd6775---duboxapawige.pdfIn PDF document text
    • http://daycamhoa.net/upload/UploadFiles/files/93799378786.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/wuwij.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6189b95cf---debipafiponapu.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b1504968---27555910120.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808797a48e3---berew.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608125d747381---gujisovope.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/21192009156.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a06a904a135a54112bd4be962f685ed5/resujinatovipamom.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/tigeraduwaronolakilanewaz.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/zugapolop.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1af0078e2b---51573974063.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/669720e2ad033191c6257318ad28cee9/57014153090.pdfIn PDF document text
    • http://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/9402021547.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/6262e28b75c70d2f46a11e185d299c60/20277891867.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/36edfbf557cbbe3ea69c7030e92b2d92/jujizopijurupowirozupa.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_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 17988 bytes
SHA-256: a1b0c73ade42a62774e231eb658a324d8274896e672601ade04f2a634b5f7a83
font_01_sfnt_off00011897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11897 11092 bytes
SHA-256: d51f55ac72c857ff4f8237acfc48e2532cbc5a1ae3cd759490fe0ced949283b8
font_02_sfnt_off000132bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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