Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf24e3ed3705770e…

MALICIOUS

PDF

77.1 KB Created: 2021-09-06 21:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b99477ef0d0d43d0c0c03d6f08d8595e SHA-1: eab567949e28bc1225b54c9b273f773873d2ab7f SHA-256: cf24e3ed3705770eb8c6508a5f190b407175780c0d8b802d4b09a1aee0951e45
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://catamma.ru/uplcv?utm_term=writing+numbers+1-5+worksheet PDF link annotation
    • http://jjkxmy.com/upload/files/202106260434546366.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fa55d9cd2---32411880680.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/9e4d4a70cd482a3411758f79fa8cba11/23311468077.pdfIn PDF document text
    • http://xn----7sbabjkhbzbqti4a3apfmdd2s4b.xn--p1ai/ckfinder/userfiles/files/89066749645.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/69383657868.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b489bcd2fe3cd68db454c405ec4a7e11/sudomedikomu.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/21023722517.pdfIn PDF document text
    • http://poorclarescork.ie/images/gomalatuse.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/nixopa.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/besojakegitiwozu.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/28911707530.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/bivimol.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///80683914351.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/80870572600.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab327aa9f1---figikev.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/odbmp38invt9vp1cklnt5g5rk3/vapaneseselafoko.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/428d02169f0bc348fb0f1d0643243824/77561050758.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082e4cc598ca---baxoge.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/25582009218.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/kavikomobexapigeso.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b7aca0acb7f---91345055007.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/99661480264.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/24827039382.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d05943a737---gupidudorotas.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_off0000c728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC728 18032 bytes
SHA-256: b401044a8c10fa19b00cf7a846091b6a1e154a32b1372d255437b00986f80372
font_01_sfnt_off0000f563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7A 10980 bytes
SHA-256: a1a7cfec298199038542321556b4893c533c0dd783316bc74dcfca3d963f33ec

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