Malicious PDF — malware analysis report

Static analysis result for SHA-256 407beb7f7514f38a…

MALICIOUS

PDF

75.5 KB Created: 2021-09-12 10:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9c13a83732f0a6478a04de5dfff3733f SHA-1: 2deae8015d7560519d63c076fb6b275773e825c5 SHA-256: 407beb7f7514f38ab3d06722db3d534364b3c2d7d536b56643df58e7e164e2ac
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate the presence of link farms and compromised CMS uploads, suggesting an attempt to distribute malware or phish for credentials. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to execute further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chcial.ru/uplcv?utm_term=clash+of+clans+mod+apk+unlimited+everything+latest+version+2020 PDF link annotation
    • https://aodaixuan.vn/app/webroot/upload/image/files/tejujorosidalitonuxuvupov.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/xikudarape.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/palusixejekolago.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/915dc584716f4f3780c73286142f30e2/mixixukoxawagi.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/sezanolabitus.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/44870722074.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/1ded56070d28863c1919352b135e2209/ludowane.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161395f5b75852---14319977668.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109121338489989.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/feputol.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613667e5d3390---96876582210.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/sagika.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/47668504783.pdfIn PDF document text
    • http://speckrepej.com/upload/file/83176283109.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/timixibufeparez.pdfIn PDF document text
    • https://aokman-drive.com/d/files/31194894908.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/zejunapelibarevolisubog.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131556d88f64---62424240096.pdfIn PDF document text
    • http://freewest.at/61825076891.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/wafozoba.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/98177964971.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/dewazikin.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/zajisutibakamupuj.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/89039222797.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/jirurigunemagavapap.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_off0000c41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41F 11712 bytes
SHA-256: 55becc67bfca2d41ca03cfe957190509cb53750a271f554020abed69d8ed8402
font_01_sfnt_off0000dfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBD 15900 bytes
SHA-256: b1f911ace711285965fff9b7c7415a9d35088742db4a14d5d822ab47d36f1915
font_02_sfnt_off00010818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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