Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9e37fc6bd78a40…

MALICIOUS

PDF

87.2 KB Created: 2021-07-25 06:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c5ef5f4974cb63d98c6a4094bcd9587f SHA-1: 9d0338b2d61a4fb4419e47dd61288fbda700b182 SHA-256: cf9e37fc6bd78a4034315ddbee882d17e1cd63d6393e6483615e67f86ff0507c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://debeight.net/UserFiles/File/57468869753.pdf In PDF document text
    • https://avgdesign.com/userfiles/file/mowojawako.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/92444943056.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a194abb6a---lowamofizugazegada.pdfIn PDF document text
    • http://lblussana.it/images/file/lefibexagilijeripobuvow.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f87c08bd4---tiwavixetajumabutekizu.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a581df76467---76425569903.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/43006388786.pdfIn PDF document text
    • https://memoservicesrl.it/file/pexinug.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/eae481733215e571c234c16ac4c2f121/28007650293.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079ce28610e4---91791295658.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/laxoduzukamusegodu.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/297f203918897b2b4985e6506e3c6d5a/vovujakagumuvavosepisoru.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f65e3ce3ee1---jesubamudonuloxiru.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/94251914737.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/58964616346.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/87535753561.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0a72a455---41739705161.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/71993464256.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/7rkd6diba8fm6mpoibjsce4uic/sugadamipunolapibogege.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609957af6a2cb---16074927865.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/2rip54ob0ikmkl3oals6ehf5d2/lakuwoza.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/k5rl50fdjvtaslj95jvfjglmi6/dodedifuvuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=j+nagrath+and+m+gopal+control+system+engineering+pdf+downloadPDF 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_off0000eb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB42 11256 bytes
SHA-256: 34444439325ca2f36496b09fba534b60b7e4c887115243eb796d15d9374aad4a
font_01_sfnt_off00010550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10550 17932 bytes
SHA-256: e6e735d8bd51613ed6b08625c67da5d4aa7120cf5bc15454dd09234322a49529
font_02_sfnt_off000134bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1