Malicious PDF — malware analysis report

Static analysis result for SHA-256 70753b9d6f27260b…

MALICIOUS

PDF

64.9 KB Created: 2021-09-06 18:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a70c9d4f13da62677b0974036523eebd SHA-1: eaccfc7df7abd4caa6c9e98aa4d5c07b91a3a90f SHA-256: 70753b9d6f27260ba39a3e77fbb55520d39562f26575fef42cc2c9d6b3b55b80
154 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 ML classifiers, indicating a phishing or trojan distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The document body is heavily obfuscated and unreadable, suggesting it may contain embedded scripts or exploit code, though no specific scripts were extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5956

Heuristics 5

  • 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
  • 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://ankurgroups.com/userfiles/file/pezinu.pdf In PDF document text
    • http://websurin.net/UserFiles/File/17156989265.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/18346600867.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/11322459257.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/9861394b851ac746a916793575c666e3/difirivedibam.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/73224738095.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886e6144001---9432680715.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/nebosonidomasat.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/54556576340.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/37415312a0cd9ab2714811e6d13e6044/mijejotiwiwiz.pdfIn PDF document text
    • http://capital96.com/userfiles/file/rabiginifowelagiwer.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/16325440491.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/70764680829.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/98116291466.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/55383234734.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1de2a0d463---15487142206.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/gufaxeloji.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/97534575357.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607915fd6b946---lovexoboxaboze.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0fd3ebd8---24834634565.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/14227492364.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/fujebisijafoza.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/516eig4fmgqdq31p3ui1u5gtk7/84219957412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=free+multiplying+fractions+worksheetsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD595 16408 bytes
SHA-256: b2ce87c726a1a4866d733e34e0e4ae3d7598a0b925d086db3bb51eada45c89ee

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