Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c02316a50520342…

MALICIOUS

PDF

87.5 KB Created: 2021-09-25 14:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 369011dfc270eea41a2752fb7d154517 SHA-1: 76eb6b9a0bd7989478564cbf6277fc0ea655676a SHA-256: 6c02316a5052034206c44cb972516823f4e1b568940afe010b4e2ce71ea656ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=l%E1%BA%ADp+tr%C3%ACnh+android+b%E1%BA%B1ng+ng%C3%B4n+ng%E1%BB%AF+g%C3%AC PDF link annotation
    • http://apartmany.cucoriedka.sk/data/files/82768055723.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/48493095514.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/navire.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/52c7c9970c85afbf1bc07279b5e781bf/rezebepix.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fff536b38d---71076122125.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/904ddaec1bea5c52088255b4c376e9dd/watati.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/3867427688.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/xesanikonaj.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/98639376711.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/pivubuwogog.pdfIn PDF document text
    • http://toonesk.com/upload/tuzopogapifiv.pdfIn PDF document text
    • https://banifatemehmashhad.ir/userfiles/file/33281241857.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/sorozenaxixaz.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/zudisilitaximi.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/gusadiluzis.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/kiveguge.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/26195842168.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/mizakomen.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/15621904568.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/vobesunapivesobasobirij.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/41525576264.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/xarogakeziralopogef.pdfIn PDF document text
    • https://kuepancong.com/contents/files/25973794831.pdfIn PDF document text
    • https://fishboat.hr/files/58694564513.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/neremujunojuxavivaludiwon.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/zunekulebajopo.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_off0000e4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BD 11380 bytes
SHA-256: 952a164413a278055aeba7747e7e545ac0798bee000ec0a2d864b3a36c75cb56
font_01_sfnt_off0000fde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F8 28824 bytes
SHA-256: f3e7a7143fc116ca54bca6411a451cb11142ceee59257af1fd837ecbea9b6598

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