Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d77ab8050898e03…

MALICIOUS

PDF

100.7 KB Created: 2021-09-16 20:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ce7e1bbbd220e722d0860b79a5046ed0 SHA-1: db89f3d34357348e6c5717534066eb6321f0a51c SHA-256: 9d77ab8050898e03f4351c9a1e4b2063a31bc0f99852f316bf00ac1b0c658220
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories or disposable hosting. These elements suggest the file is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9853

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://huntic.ru/uplcv?utm_term=xperia+system+update+latest+version PDF link annotation
    • http://weorderfood.com/uploads/files/taxututetasobitizagavaka.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407b52bad72---12411717368.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109092218291775.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/71fbf24e983ffee266398f7f72871104/getubawaxuramadozope.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/zupozonafafef.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/jiwugagufitagog.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613280bf8ff85---78261860379.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/21703330288.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/46741839934.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/satufefamuwedoxul.pdfIn PDF document text
    • http://ilkemymm.com/image/files/gizagegudigetupojaxudoreb.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/ronerononovinovigod.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/28009172111.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/e98f94481c9b5d90fa66df141122d7d4/96275506016.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/95753688397.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/bb3a183b29b3694dc487a1814a016157/buzetumi.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/bifetiviwiw.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/33811655423.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/519277663.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/vurezabuzefozonanomamu.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/36423113715.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/15096786272.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/putuf.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/pre1ctr6cl7eusnsgh4kl900v2/40965402566.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/38650582855.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF558 16804 bytes
SHA-256: fae2c9cdd9f2c03457b794d37a4e0272cb5ce5c8d235839a25bcf305a4538d52
font_01_sfnt_off00010d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D85 10840 bytes
SHA-256: e0153e21ec9d221417732e57e7dd07d605ac0e5136be89b95433f8e7e4b5bb7b
font_02_sfnt_off0001268c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E99 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_04_sfnt_off00014691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14691 23728 bytes
SHA-256: 943ae422336a3744f108156cedbcf18c39b9fc050f7fdbf741e10b19c6a33196

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