Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3b8e3759613e89…

MALICIOUS

PDF

89.5 KB Created: 2021-08-06 01:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f3664dbe8749ec6c8e4b6ec6f622670f SHA-1: 7d7654f520edbd65ae0c72b3d4ed9952e198412f SHA-256: ef3b8e3759613e897f92374a07d934c3e4bb5d72bb34315b8522ea9468ac1204
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content. While no scripts were directly extracted, the PDF structure and link farm indicate a phishing lure, likely intended to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a749e29f43d---29774586479.pdf In PDF document text
    • http://www.contectrade.hu/fckfiles/file/37650549158.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/baxemudodotesimegajemi.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/045c148339149d754d6b051feec85f62/sitapuwedemi.pdfIn PDF document text
    • http://hillandcunnreunion.com/clients/864369/File/75769388331.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/7dii5qnmajhr4u95j3mn6g30ba/18228886817.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/31252120804.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8fee58ac0---10324409418.pdfIn PDF document text
    • http://farmina.ru/uploads/files/59789694402.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c6c014038---butorivawixided.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/09ca05df6358950ac4c98cce36296488/juwedezedimemafekapefo.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/cf117a061b4330dbed77bd13375caf9c/5969812659.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/94864937338.pdfIn PDF document text
    • https://artbynela.com/uploads/file/sonewezusedij.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/14364492310.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/83748659374.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/277eaf1db67a0be920f16daf33228db6/kofogewufuguves.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/42012071090.pdfIn PDF document text
    • http://alcantara.cz/data/file/96081213736.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bea8876dc---64851493345.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/697baa9a8c80d48a25076f420693a4d6/2516390575.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608146939ce88---22439900260.pdfIn PDF document text
    • https://banghenails.com/upload/file/25181186363.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/91990ca302a249e2b46073234b9f2aa9/fazisepima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+outsiders+book+chapter+2+questions+and+answersPDF 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_off0000f5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CB 17460 bytes
SHA-256: b145708eb59aa6a6863ddb80077730641d250bd30be48fcc91428bc0dfd8ae30
font_01_sfnt_off000123a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB8 11212 bytes
SHA-256: d832f74c5426183b246eddcf137e725fd767545a6b264207cfb534a68434e3a9

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