Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5caf4464132534…

MALICIOUS

PDF

124.0 KB Created: 2021-08-02 09:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 05cf8295c33a55d8afca0368be0bf3e9 SHA-1: 56625461ae058c56cfb6e66d092d50614e9a8130 SHA-256: 3c5caf44641325349ef7612d255e8b0f58083d04ca78144df47d9345c4373f83
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

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://kubak-ubezpieczenia.pl/userfiles/file/40749572570.pdf In PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/39581554193.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f804832ac---10329228744.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/95238463428.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/mugdcdfv0hqeorlep1s7m2eo2p/pijutav.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/19995934243.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/7487823273.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/55269045593.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/95d4f88911db04843cf408f9bc6d32d0/85967521267.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/f5utdqhkd2mii7lfqc3vusa4o1/50301801233.pdfIn PDF document text
    • http://fygl.net/uploads/file/242356195875.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607487cfdf0de---meganeto.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/11956441881.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/38130361756.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/77e572130618ec8792194affcf58862a/65177429627.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f5465269a96b07e8bbd54fdfd72591c/7961066016.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/fd96971a9d7c06d4542f1019a726acec/83892906368.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05d5a4f027---muzelaxa.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202164328586512.pdfIn PDF document text
    • http://ideas4mypool.com/userfiles/file/70508101264.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/supewuxilin.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/8c077b9a54b2b7a9c8ca08e0a1aedd30/96260683535.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/9c0e3b60eb8eda6fc4299883035c9093/relisupefaronujowafat.pdfIn PDF document text
    • http://voijin.com/userfiles/files/vofilitarasupegupuma.pdfIn PDF document text
    • http://megaeventoa100.com/clients/f/fa/fa03970f5feff24be7017758158681b9/File/xegexobejobujaxegesos.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/16340670361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+pray+for+miracles+to+happenPDF 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_off00017fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FC7 17812 bytes
SHA-256: c8f4ad7c698c767c7f2787546c9a14354db1f7ff7aab914f3ebfb755ef127e09
font_01_sfnt_off0001ae0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C626 10936 bytes
SHA-256: fc29c373b1326324ee431d3516bc9da8793fd911135012a8303934b745dccac8