Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ae30891e93f895…

MALICIOUS

PDF

108.5 KB Created: 2021-08-18 19:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f360dc7310396f2ede905c7cd87eb679 SHA-1: 044d0778163b95b62eb21c6c6be4001216c9be5b SHA-256: 83ae30891e93f895c72c0339e0fb8fdf4b822c4bcf60570062bd572564c9e692
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on compromised websites or disposable domains. This behavior is characteristic of a link farm designed to obscure the ultimate destination and potentially distribute phishing content or malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/v6e2octknahpklpcbke0fsbtcq/38824125846.pdf In PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609012799203e---16155100481.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/xifazeloguzuwumarupitak.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/3020338723.pdfIn PDF document text
    • https://promise-land.com/upload/file/tugitin.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079972bbf4ae---vabikowopupokosusiro.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16112ed5444906---dulinigawu.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/11962278727.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/xuribarote.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/207fd92b0c8e9f8323ba41cf150574f1/75424475931.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/peguweve.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/95954145835.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/14241366844.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/81101190792.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/c6ov37ghs9v3ckkdvnh30lacc5/82366962196.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf11ede3a72---xubovuxu.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/22806882659.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/78811750237.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/84351091039.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/55882892974.pdfIn PDF document text
    • http://apvn.info/userfiles/file/55925757931.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/70461613882.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079cee03a347---64348567680.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/64445665604.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acc3192bc4---94281093822.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/3dd50443ec1b43754668da0630403184/noguzesujojowepunos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=quiubole+con+para+hombres+pdf+completoPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE3 11184 bytes
SHA-256: b8862e420d0e64ace164249277e61b479963aa172f5db47517012dea53f6b74c
font_01_sfnt_off000158a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A8 19792 bytes
SHA-256: 656a4531d3a5388a53c5da2b9cc9d0a194b1726ece4616c47cf4e40551d633bf
font_02_sfnt_off00018b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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