Malicious PDF — malware analysis report

Static analysis result for SHA-256 8159aea89db960ba…

MALICIOUS

PDF

91.6 KB Created: 2021-09-12 03:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 28a21bcf921659339a5262ce9ce13fb6 SHA-1: 3b8313a40373def3b788a2c13f168cf68b56e945 SHA-256: 8159aea89db960ba3ceddb77012b830e127bac2472da44757c1c4d5c4e71d9e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm designed to appear as legitimate file-sharing links, likely to trick users into downloading malicious content. The embedded JavaScript is a common method for initiating further malicious activity, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=file+sharing+not+available+wifi+direct PDF link annotation
    • http://matsonconstruction.net/userfiles/file/digekidilizurizejimam.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613396eee9c07---9831646800.pdfIn PDF document text
    • http://emeat.ru/var/files/sisepamamuvamepikut.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161353760aceb0---87822317532.pdfIn PDF document text
    • https://dm288.com/slicice/file/49227514404.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c5174a08b---mevopegepa.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/29672614658.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/93492841985.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/75755812657.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/molejed.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/pikef.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/92280204521.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffbe4ba47f---jozokulo.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/wafafegimubedarakefakow.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/99433624134.pdfIn PDF document text
    • https://vzglavniki.net/data/file/23492717059.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/xuxerotanibawusasib.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/90220757872.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/66656682621.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613730b6f3899---42505331226.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/bomegibuvumutofugudetod.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/54567060294.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_off0000ffdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 18648 bytes
SHA-256: b8a2dd084a39d49c029a2278ed79dd02f91b55bc367be7a876e7c4f4053fae59
font_01_sfnt_off00012fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCE 11024 bytes
SHA-256: ef8a4438e2949b49e0435f4b2b23081c04b875cadd0a2390c32617f8085b150f
font_02_sfnt_off00014940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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