Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1ab31783f0c6fd…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 08:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a8b8aebbc7b5dc0c0e3ecaa8cbb42b4b SHA-1: 601956128a878923c84386abbc52e67c95f7857e SHA-256: 8f1ab31783f0c6fd75bb49631768f88ed3e4b33e900a7ece66e7d5d79e254463
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to obscure the final destination and evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bce213fdf---43822765874.pdf In PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/4860086783.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/wikelo.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/diranekefotezinifejutidup.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b90c17464f---sutukugeb.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/20f68ff73b2a6c9ea18df31252f0fd5b/lijokewofixoxevivugowajuf.pdfIn PDF document text
    • http://yilip.net/userData/board/file/2557436531.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a78c1a0cdae---71921972298.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/290748129.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/15630001857.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/2525133686729eda71ca41780d6b56db/53154514525.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e7260d413fb---pumegarelesikivij.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613310594911b---49649796121.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/pilebugakidobedezizarugo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce191df120---15769215896.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/pidamapunodemilad.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/musaxofanajukomatifaxe.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/pofopiwete.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/momovuromojafomifawazeved.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/57471785479.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/47097585337.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/jerobikidiwopowidi.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608956494999d---78225223503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=osteoform+70mg+bula+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_off0000dbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 11080 bytes
SHA-256: a27e8c66b5f27cea7ddfe471a3bd2b1e523707a56a5dfa1d8a648579c7fdc6a3
font_02_sfnt_off00010d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 17876 bytes
SHA-256: ab37bc3a3ab731e04343dc13168bde74fae4997881ef1ceab1d3fadd678640fd

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