Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8cd97ac9c8c512…

MALICIOUS

PDF

80.2 KB Created: 2021-10-06 02:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00486903596aa570f142678242cc4c25 SHA-1: 8a9562ed79c82e20f75505753ea76eff4bfce7dc SHA-256: 2e8cd97ac9c8c5128108e9478364db0a8953d5a8fa0e2c4b9d7d1f2e908175e2
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of JavaScript indicates an attempt to execute code, likely to download further payloads or redirect the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cructi.ru/uplcv?utm_term=manually+reset+check+engine+light PDF link annotation
    • https://bellcera.60km.com/upload/files/varosatomojiwatef.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/74d86a23eca1bba74581eb26e0466ee5/77817288451.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/46910596342.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138c1a085097---69959807026.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/56281712989.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/bikuridabiziwaza.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/ponuziverapowumetev.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/65525511970.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/talugoxosimeguro.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148607400468---97320249103.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/86633173410.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/27852286028.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/77298958663.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/25552143004.pdfIn PDF document text
    • https://limsurdua.com/contents/files/92320820850.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/5157721244.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb722ec373---60169002413.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/majerotozonipepovug.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/mupapomuzimezudemerefojom.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bf4580226---61473792709.pdfIn PDF document text
    • http://dges.in/userfiles/file/7378004519.pdfIn PDF document text
    • https://eclearusa.com/images/file/zemenetojizomidunu.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b00354678a---gabogowaxotewetoveker.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/13006016398.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d7944a2fc---rinezuxidim.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_off0000d70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70B 17264 bytes
SHA-256: 01d2b358b964d9b48f5315b908a3b11c92a25000fa542eb2a460930da03ab539
font_01_sfnt_off000102dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DC 10688 bytes
SHA-256: db41e9c896df7194a5e53f0bef79b9ae94fccc9167a3cd84967a42b11d1cdbce
font_02_sfnt_off00011b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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