Malicious PDF — malware analysis report

Static analysis result for SHA-256 76fb438f5c54ee33…

MALICIOUS

PDF

87.2 KB Created: 2021-08-08 06:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 40dee4b3df4a262b4e679900d657ae72 SHA-1: 5bc7b49ae17b1e2bfec6873919378d5aabd5e716 SHA-256: 76fb438f5c54ee33e3f8233b6c870f87a97e50b9e26f4c202e752398e2a9fce9
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or lead to phishing sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://synerhu.ru/uplcv?utm_term=ulead+video+studio+free+download+latest+version PDF link annotation
    • https://camgloberealtor.com/userfiles/file/fisorudowalezatukizufulox.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/govafajoj.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/d2e41a428119e18e5b18ed8060f81d04/rabebakiko.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/16398724096.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/nobomeso.pdfIn PDF document text
    • https://lazerom.pro/media/file/pinemuzuvegogenavos.pdfIn PDF document text
    • http://odmooregolf.com/clients/e/e7/e7046aca88cfcc92de0be8f3f6b3de3d/File/92136378739.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/dv6584rql1sudd9nhg1h9umngs/74396655315.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e74a5f384---16409336278.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/dozinunuvibenasuxigizit.pdfIn PDF document text
    • http://irollee.com/userfiles/file/dukarozeturotafobuzu.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c18fdd106---virerexejodotitagefub.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160924d34a6941---64392216048.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/64632528093.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e12cceef85---vorinerujo.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ac657ce2d---nigafupometejosube.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949b5ac4a17---naxor.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/44917079067.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/76891364929.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/rarutumevoxulurewoma.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/8osv41b3a0pllebb4vcs9mjbd3/20760751419.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8957eb4b16a153413b8d43098a99dc28/9846853566.pdfIn PDF document text
    • http://trevorhannant.com/13368764348.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/zuxirakoselulirolix.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_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C7 10604 bytes
SHA-256: c4811a9bb5cf8098ce2f59ce7a96d949bb35442e9cf84e0e9ed9ca76a08ff90c
font_02_sfnt_off0001222a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222A 16976 bytes
SHA-256: 6b8b9567a00f5e9c06188c9bb66da46ffe514b4a292db51a75ece2284e60e5a6

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