Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b66b70d186158de…

MALICIOUS

PDF

82.7 KB Created: 2021-08-12 09:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1154ef897e74ff504c6931366ee0e763 SHA-1: d19a8461f089292ea879e9f209d1deb02f2220b3 SHA-256: 6b66b70d186158de8c3fd435add06938961c51087c41df233a63183d47e0f13a
156 Risk Score

Malware Insights

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

The sample is a PDF identified by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier also strongly flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://infrive.ru/uplcv?utm_term=unemployment+peuc+extension+michigan PDF link annotation
    • http://cpgny.com/userfiles/files/kixatuwid.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160afe027cef71---57240346048.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc65118d7d---binebuwibede.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/kedol.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/danakoditod.pdfIn PDF document text
    • http://abwva.com/uploads/files/4615119562.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/43235041213.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/mivafazonudalubudad.pdfIn PDF document text
    • https://tigapilar.com/upload/files/gewevemamutosapedesekapa.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/80c6dc68ce7171652a08fdc65fbb2554/muxodazixabusisosoko.pdfIn PDF document text
    • https://medius.sk/userfiles/file/zagozubixemed.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b073a352298---kepokabokideve.pdfIn PDF document text
    • http://emachn.com//data/attachment/file/32204487581.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/pvinih1c3lsg6a8eoe7k5g2ruo/sojoreliw.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/193ac251b0cb8afa2c7ea87ea1768f5c/27177499766.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/cc6h8ftvfg6fl8mq4ka6cmn687/riwefifukutefegifepixup.pdfIn PDF document text
    • https://unaizahic.com/Files/files/pagofoxopuvekumuwen.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210731020341.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/76797881628.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/rozesobokarubezuditam.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/vche1iqp63r0iu8ngk787e1s92/lazojitozoz.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/cd4f15698fbd8dfdc36029bfb16c6e73/13798596483.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/fibatuk.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hjeur95fhvbpnein2j3folcjhl/34773473196.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/pejagofog.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_off0000dea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA1 11044 bytes
SHA-256: 4d8946a96c1054e63ca091e3c23ba2d1e97d75066484a0ea33b3bf845a92c0b3
font_01_sfnt_off0000f835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11047 16776 bytes
SHA-256: 9eab8d7f6938faf1348f25d0b42359005921998100fb437d3a27451ca63e8dbe

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