Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b6054eea2cfc71…

MALICIOUS

PDF

83.8 KB Created: 2021-08-20 00:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc704abe3fe75acf51bf82d141cbe073 SHA-1: d1f30719dd4d519478eadaa596887b187c8c48d8 SHA-256: 66b6054eea2cfc71b8f2795eeba65fdcda6cbfc205a4abe8ed7fb648fa65eee0
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://cedule-plachty.cz/files/file/97407741927.pdf In PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611316a94d1a2---guxebejodux.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/2120110914.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-17/20210517011002200308.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a699d6e3d0e---80933379660.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/xofineji.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/givumogiguzixasuselorigel.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/budidig.pdfIn PDF document text
    • https://hoalavender.net/upload/files/45930275896.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2153mu1fgmtpitjcrocvqr2tg4/39234167171.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb5217a8dc---tevokateramugukewiwoze.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9b29afea---31610385196.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/55846915422.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1629399444_1aacbf645e.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610443f57a638---zeloxefofotepolifesaweba.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/47227714146.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/tunasaxepig.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/rovoxovusurir.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/dozizuferutemaganulad.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/7220374656.pdfIn PDF document text
    • http://dzbnf.com/upload/file///10369136443.pdfIn PDF document text
    • https://ivaco.it/file/sufasinipusenev.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098eafbb7fa6---vomelonexuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=financial+accounting+made+simple+by+robert+igben+pdf+downloadPDF 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_off0000df2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2D 11380 bytes
SHA-256: fb04fccab9785bd9fb4ef9a1c3656a891aa4ba3aa0a1a8b213ac0efcf9694856
font_01_sfnt_off0000f9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B5 16964 bytes
SHA-256: 7db38619a53928c75bf0ed1e9a9c58a39544ccc545b424fd2359c73cbe907457

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