Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89d9fc389b7901b…

MALICIOUS

PDF

76.1 KB Created: 2021-05-15 23:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1270b4dd23c05191e97fffe93203e8b4 SHA-1: b872d1a30fc889f66da64ceea48a4bc862636226 SHA-256: f89d9fc389b7901b0888db50c66a7f4c07efdafff4946e31d72ccf3be2d4bcf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely serving as a phishing lure. The presence of multiple external URIs and link farms on disposable hosting further supports its role as a phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crewmak.ru/uplcv?utm_term=apple+alarm+clock+sound PDF link annotation
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e28b6ab1f3cdf243db015a0b5ecde8d6/55020684813.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16086c4c33e755---18663740419.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093219e2f0c0---69341688227.pdfIn PDF document text
    • http://yilip.net/userData/board/file/30268551829.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1c6c6a721e7d7fa8c8fb4d348e35ff5f/54180274101.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e438e74699---82792681888.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5cc2ea5dd745af278d5443667fcc8715/bijotiderasudoxajukixi.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdec347143---wimatunipogadadodu.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941ec2e8202---wuzupomiwibivuwobeduwixuk.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608efe2d76c64---6687823085.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/31a1627caf7b19f5c1771d9199da18f2/lirutuwoje.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/4rc4pjacei4fi98n2d5o2oldk5/zizufitukawaje.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/lgh0r8kbbe7s2dq1mji71c8dng/79136635445.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/lifujev.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/60e71edcbf4edb272f8acd259c6698e4/11434285699.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/49f1eae2a6c275da1d829ceebc18df3b/53040308554.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160864e07e3932---laboxaparibise.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000d760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD760 5272 bytes
SHA-256: 3751f2662002372f341f996c525e36c5c89738865ccba2d81ea7082d42214e69
font_01_sfnt_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 11032 bytes
SHA-256: abc474d6535104b831cf59cd9c7a8e5a94303e6a5d162c466b238c4af24b4d85
font_02_sfnt_off00010ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED0 16272 bytes
SHA-256: 4a1da061204ffeacf37fc13f7d5dbd4ebbee4cb191ea8a5d14a92661125848e7

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