Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b22e6211cd36584…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 04:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ea1781213a7e7e6c1b206b7c5afffdcb SHA-1: dfd02d3bb6298e373dc74413ca6c879b3600094c SHA-256: 5b22e6211cd36584c134ce681e85e99536b49a527ff992721026d415ad1aed48
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains a link farm pointing to numerous disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of a 'download button' lure further supports a malicious intent to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://fishtech.org/uploads/userfiles/file/file/86098352463.pdf In PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/66217991581.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/tireb.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/03oi696080um2o9eh8ri20vot9/82431017668.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0db9b813d1f115b863b1991b6271e763/bunujiz.pdfIn PDF document text
    • http://kyea.org/imageuploads/fenapir.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/31422652795.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/29148666407.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/moburotuzigezoga.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/retow.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/60284455184.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/dikaxumiveniruz.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/kebiwibegarotisadad.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/dabakat.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/1554842472613d2a30665ff.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/47671406500.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/jatapovipajutedakalovez.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/45533263212.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/35546863488.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/togixodisisa.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/2360207731.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/24268312666.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/fosodoxefokeverole.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613243cece2d1---nijovawaxuje.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/27895798566.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/zujakexepajezejax.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/86708995090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=windows+10+1803+iso+64+bitPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E8 16824 bytes
SHA-256: c9d24b82a83514b1fe31fa84d525ed1532fe74cb7499d636c93494f0ca321c38
font_01_sfnt_off000104a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 10820 bytes
SHA-256: 3e162b33843d257bf8d2827a271cfe5caef6b09e801a572c858cda42f006cbad
font_02_sfnt_off00011ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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