Malicious PDF — malware analysis report

Static analysis result for SHA-256 552af8f31c4b724c…

MALICIOUS

PDF

69.0 KB Created: 2021-09-09 03:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d416bb24eedd90aced4c1f703b7e91a7 SHA-1: 0170d1b99609b26cb338e4e1e5506aadcfdff48c SHA-256: 552af8f31c4b724cad3ba6bdd66f738a2f8cec6ff889de9572eab858098abb5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://restaurant-kamkok.fr/img/Data/file/20284965982.pdf In PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/wowiru.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383a0d36a30---navowofajezaset.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/22009298436.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/15671198941.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/funiw.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/83824744994.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/221f11b9dbdc1340a59ef794f247b0e7/76658348277.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/22457564066.pdfIn PDF document text
    • http://dnepropress.net/files/file/jelafosujomo.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210902_105942.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/71075178891.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/02d73bg0of1aqiedjn1na551qc/nuzotovasew.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138a09150094---kolofumoz.pdfIn PDF document text
    • https://harom.ro/files/file/4629475164.pdfIn PDF document text
    • http://ore-processing.ru/d/files/95601846952.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210907_83061.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1602055807.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/51351814651.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/68406370025.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/75443232226.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/supogadubuwonewakoxiregud.pdfIn PDF document text
    • http://partnercable.hu/files/36731431338.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/wumemub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=apk+dragon+ball+superPDF 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_off0000b16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16C 14776 bytes
SHA-256: 728e34443437e238eeb74b5aae2d4d6c970bb780916334f88ba29db01a70b07c
font_01_sfnt_off0000d651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD651 10692 bytes
SHA-256: ee8e9cabdf380ba6f27f4f14e425e78568e15b4e67a2343b9e7068143d123d43
font_02_sfnt_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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