Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f4ef0febd38ec4…

MALICIOUS

PDF

92.9 KB Created: 2021-07-01 17:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e53922a5dcee4880f25ef68baf3870ed SHA-1: 25fd2a1aede5e8b052731382c9ba56080338fcc0 SHA-256: 46f4ef0febd38ec4e0c4aeebb692dca035b66d4585bce66833a49830bcd537d6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The PDF structure itself appears to be designed to host these links rather than present readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/dd263f217118ff6d83bc5b0831f78a08/deveb.pdf In PDF document text
    • http://staropolski.net/Upload/file/tusesikobezuruniresutujez.pdfIn PDF document text
    • http://wmhsclassof1977.com/clients/34196/File/zawafexomezomijulijasa.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/14b2d022a4c7a465a4bd3725622b4716/kamini.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/j77nogktldd7vcmcc65d3ot2pv/dakisaredovavewilo.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/mudibedipepetufosutu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16094c909a6218---19084943638.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/pobiwevivusibo.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608dad36a06ed---15968444358.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/62a6b9d68ed8aee012cedd071090d823/kivivamo.pdfIn PDF document text
    • https://service-panev.com/userfiles/vepifupavol.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/94506326310.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/4cb3nhd4p3ltem3f7u2j4hm8e4/6954867788.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/79452585248.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/mitenede.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/j4tc5q8j3hvf4b2fllpasbkj0o/74998050408.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/16779951033.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/b19a8ac36aeb028880c119c441cfce5c/29775622511.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92cd615df---18727716987.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a558be1f7---zanijuwobisadofuxunexan.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b15bd993b---96472808983.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e7656cfd---54212905888.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/50270268683.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7c3250cb1---66195692219.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/lufajiwogurudewuvog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=hollywood+horror+movies+download+in+tamil+dubbed+in+isaiminiPDF 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_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 17812 bytes
SHA-256: d07a6dfb43b6e7ffdf6e635d9f6c4d2b82e25e9c58e4459a867f32ac55d7c444
font_01_sfnt_off00013405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13405 11012 bytes
SHA-256: 8ee8f583a8cfa4b7e7e42fdbf4b59aa3ba47cd822f6dfb121d71dbaf39de4e4c
font_02_sfnt_off00014d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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