Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7544bd0c855f90…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 15:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 68b852736d31700c086ea01ee4d78a2a SHA-1: 48d65f69251d01d981393ba6198614369cc37dd3 SHA-256: 6c7544bd0c855f904f3a439a240b75fd396f0629a4abc6f1219ecfe67b2a39f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=first+second+third+conditional+worksheet+pdf PDF link annotation
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/84d9a44f97dd6f3fd5af01e64e20b489/50235563049.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/14779996730.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/welejatopoxese.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/dirovi.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/e2335a1h3dqbhohretj7d852m0/76171700488.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160873bd86beed---65347237264.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/30bb6dcb6e5282d3e67ccbc2856f8c1b/76978306491.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/faxilirozorako.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ribivirorosolew.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/n9usrbhoomq423n1afol14chh5/26102682566.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/buvoviw.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/fuxax.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/zodopetomomuruvepuwabu.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/34375578796.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bca3d7b41---bawugiwatorivofe.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/486cc4de3a392bcf59a1cf7f6bca30de/81018109752.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/pomop.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/88690db39035e339b48c1698b7ab8852/rikuz.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/11437329189.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2e09ce32b---52624413936.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/6708745451.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/45e85f132e79b110a2aa472c2e217e01/buwupegor.pdfIn PDF document text
    • 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_off0000cda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BD 10872 bytes
SHA-256: 7a004cee83ce0c581feb8509da45b79e2811681f5eb41023473337b793600d16
font_02_sfnt_off0000fed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED6 18140 bytes
SHA-256: bf1ff8c21ff306798884447c1d610c9ca6002c146fc9404d5a1bfa3413551d6f

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