Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5972394327b413b…

MALICIOUS

PDF

115.0 KB Created: 2021-07-27 22:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 807c477685aee80260db7b100efbc98b SHA-1: 018f993782c6b103c4f2075c76d9c0f3df92380e SHA-256: a5972394327b413b7fe97f8641469b5a42aa922a09858c7eb33c62745b7e7984
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit vulnerabilities or lead users to phishing/malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://vmwarts.com/ecovic/file/nawomoj.pdf In PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/i7hej7dp2oqqmotmf99rk6blnd/jonirokamiketexigezuzol.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210708_B4FE70839F2CFEB8.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/ba44a2792ffe8b594522cd6920ae63b2/55449801698.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160821883a7fa2---puxaduke.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160948a2652b7c---samofafugi.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b8ef55527edadf1a01b06bc6ecd5520a/vapunijezotavinurukuwe.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/xigoselupesixebe.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607393074895c---romagabigut.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/jodepotalegufexar.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160af675853300---18530693842.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/f63a42f02223d0430768023209c973a8/xufesubojumopoledi.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804d7f3914c---67924744526.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/26493003493.pdfIn PDF document text
    • http://2440027.ru/upload/file/tonexudamujorinegizuwewi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9f6ac42e25ac39d1e5eeb08342313922/sonimukisikak.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de6765f17a---25059426558.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/48872278240.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/kqgle7sacr407icabubud0u38u/66468024738.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/25aafa8827eba480c0ef492e9fcbbe0b/dikufidorukogadi.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pobitewolunojidofomaga.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/xurawojudodi.pdfIn PDF document text
    • http://sireny.net/share/files/jifirivezovekifukakudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=las+cr%C3%B3nicas+de+narnia+libros+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_off00015c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17475 10748 bytes
SHA-256: 6445161d73470cf6e2b819681513384d5562d7116b85617fbddf7b59d0acb5e3
font_02_sfnt_off00018cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CBC 18472 bytes
SHA-256: 412af7b3da24941e43a519e9d7d142ca9eed326e4b426166d42b65048cecc74b

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