Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb223dc4113a6ce…

MALICIOUS

PDF

111.8 KB Created: 2021-08-16 01:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 85efd42ff12815361f84e8eb8827354b SHA-1: 7e819322854265c2770c9ecc1f0f459f7f850f27 SHA-256: 3cb223dc4113a6cef31b280a698361242c5e8268d1888f73d49a11a3039cb011
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggest a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/407706980.pdf In PDF document text
    • http://thepokeluau.com/uploads/files/3982632714.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b46f9761ec---duvabedalude.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/79648193069.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/f11cc68pfqpk7s25uqeqfi0u66/78304470543.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160f3eae1ad58b---42179442198.pdfIn PDF document text
    • http://araonline.hu/uploads/file/wubotogofubovija.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-19/20210519232131483831.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b27a669c925---57254187432.pdfIn PDF document text
    • http://yilip.net/userData/board/file/zulumeso.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/fopatuva.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160b21c7ec7cf8---feporovisevedopajojipeju.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/83524724540.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f36bf9e6ed3---toxazozob.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a625d8b94ef---94347379592.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/ebbed47f3079105a4ddc96d29c6c6ad2/83260725255.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/0db998d530fca15ce4e4e8d389553168/10413445700.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/e6f3030f9fb90571d52f80404f9a60dc/gekuguriwaxoz.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/56447754411.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/17977195883.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4def2b618f5481cd8dd729a7f41ec005/nuwitimonigube.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b622bd250ca38c3eeb07703a5135e078/lufeborisum.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/rokidip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ejercicios+de+probabilidad+poisson+resueltos+pdfPDF 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_off00014a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16256 10964 bytes
SHA-256: c5ad85d4a8f5e3696a13e31de110718434c9c766156958f32602f21341df231e
font_02_sfnt_off00017b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B93 19616 bytes
SHA-256: 7789b34443dd30c46ecf6bccfb3623020f6586f1bcb1a7e289980a3bac16726e

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