Malicious PDF — malware analysis report

Static analysis result for SHA-256 24255a0ea1a396b8…

MALICIOUS

PDF

84.5 KB Created: 2021-08-30 23:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2256f8838b720e0db7a040a1239be323 SHA-1: b6a63ed448819b740aad93fc048a5836f7b860ec SHA-256: 24255a0ea1a396b8f0d7d41290b73c3dce79a64f440c939caeafa3a2fa20ed1d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely to redirect users to malicious content. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the final destination and potentially engage in SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f2317bfdd---22280705651.pdf In PDF document text
    • https://anmimar.com/royal/userfiles/file/38602435988.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31663726255.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/sivifekipojedisu.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/44138465479.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/h8kvmka7iusmnj4g7ehqgq67o3/dadaj.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/jagov.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c55af7a9954---82923446515.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/88996206286.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d7826cb41---55651196671.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610e47a4c439f---23971188145.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/67913995824.pdfIn PDF document text
    • http://meskerjager.nl/media/files/dubojake.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/217f359f94a060886af15482da7aa86d/werikijowinowijufe.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/36782660517.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/33228009363.pdfIn PDF document text
    • http://redsky.tv/userfiles/files/kasulomazifur.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce928de266---nulitagadetotoxike.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/nujor.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/24287534716.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c49df3f4d94f369699e0c2f76aa288ec/kiros.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/luxozaraleragurenaja.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/negoribar.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/15286347087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=signals+and+systems+2nd+editionPDF 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_off0000e344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE344 10800 bytes
SHA-256: 249844fe7fef2cc63bd70c052261e4d757adc9488c25de9c622037cdcebd91d1
font_01_sfnt_off0000fbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFF 18260 bytes
SHA-256: 32a4fce66c95e38ad0e4093ddd0604c5dfcfe5bca9367ed9799ae684fab0850d
font_02_sfnt_off00012bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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