Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cad4e057f572ddd…

MALICIOUS

PDF

87.5 KB Created: 2021-09-08 07:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8f0cbf4fca3c4ff52cfe9a3eb01e036e SHA-1: a4c06d1fa57844d8ea773962e40402b84b14e87f SHA-256: 8cad4e057f572dddce31411788a086721d52065ead2069848a2da8b4a5effd32
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised or disposable domains, suggesting it functions as a link farm to distribute further malicious content or phish users. No scripts were extracted, but the structure and URL analysis strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202104282304051148.pdf In PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/308469522ed1c0c66e31f6fbc311c879/dovokisedabizedisojajita.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/raxisodunelujoxev.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16105423c7e999---66210055303.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f222c4dd4e---20125301842.pdfIn PDF document text
    • http://bdn10.cz/files/file/zuxilurerajubima.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/zixixuf.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa62f481174---65989295554.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/4458238757.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/jawuwujebono.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/15144000330.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/35206574684.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/dajipezo.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/24571586686.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/1d6uuodm4lvqeves44qh8h8fm4/32309424816.pdfIn PDF document text
    • http://dongphat.net/upload/files/68240482336.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611f589f7d1d7---71359765080.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b775cdc460dd63ff746d67144b44bb87/14747255143.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf22a67243---73260104340.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f1c00827c479fdde7a613858cf9a04ae/puver.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d848aaa2af7---46612561356.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/d260e0be710e1ab4197d4abba45b6b86/38280521279.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/19660526581.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/rojitupazunevomemajeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pokemon+let%27s+go+weakness+chart+pdfPDF 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_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 11188 bytes
SHA-256: 94e71ba08e5c3739d4b0a69d6ba212384131f42d2e35002d525b2baeec9427cc
font_01_sfnt_off00010679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8B 18684 bytes
SHA-256: c5317a54265601525b40548e7f4d4a8fcd822c1b0d49c6b58eb962678f0ed985

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