Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e1729915349a08…

MALICIOUS

PDF

70.9 KB Created: 2021-09-01 10:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bf64ea37619a674137b9692d1a344349 SHA-1: bc0ded44dd0bd49e9945e50cac2c68d29ea1f4c8 SHA-256: 57e1729915349a0891ff2e375af12e8cc0a57999473ee76bfa1b24e8dbf789b0
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 distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to host and redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://creteotels.gr/FCKeditor/userimages/file/48535641723.pdf In PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/ls4enn7bf4ha8r4atqrgjn3ms6/48823443678.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7dbb74a241789933cd19970a9ed2f8c4/54907804842.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/xokogofunokofikoxuvoki.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/deebdef5a688e116c4800b4697f58d75/bomipupupenozulo.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/15cddca7a2ce3cabd7508a52c24e3452/pizovewa.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bc87d0255d---reluvalemomoso.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adee7a1edc---11999983030.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/86136537216.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/71935723502.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/16280375689.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6d5b85390---woginuwoworolisem.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/6qciat7s297qbb2lbe6impuvvs/fazutufekezafax.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/kamilip.pdfIn PDF document text
    • http://89928386.com/uploads/files/202108140242202214.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d9476b3c2---67035864550.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210823_225739_8143.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/wosurexizebenuxinixinane.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/a0gpd51b94etf579rv5367uln1/pivujevexawozaluxekog.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a1ff22d63---49553585357.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/jogalowiniwulako.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/42120740693.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/jugaketojaragevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=gs+13+military+rank+equivalentPDF 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_off0000b433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB433 15960 bytes
SHA-256: 386daa8442c66cc60b56fe52b54aaa4beea67cdfd1f72a7f8b237a5f7265acba
font_01_sfnt_off0000dcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 10928 bytes
SHA-256: ec55de51506cba38f5382921a1a8bff78d0bfb1dab9ec42f0a821ec829a3ba02

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