Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1fb3bf1d03a72e0…

MALICIOUS

PDF

69.5 KB Created: 2021-06-20 10:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 856b6aa908bdf3aa27cafebcc9138bd2 SHA-1: efb1c14a46e53b295695ba7739aea29bf0575bde SHA-256: f1fb3bf1d03a72e082b31f526ca02762fe4eb35c0cf5773c9f0fa903c2b20a19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to distribute malicious content. The document body, though heavily obfuscated, contains references to 'mp3 free download', indicating a lure for potentially unwanted or malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/8b5cd1459ef1fbd3731d7fa801dded8d/62327660346.pdf In PDF document text
    • http://generaltubi.com/container/ckfiles/files/73335561396.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/lkac8lh5t81hhgc0n40pmnfgok/wodujibewoxanixokigo.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/3i49kk4jos4knn6ahbafs7n8ge/24573238713.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9792e243f---20469467413.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c569d4625ce---23202048629.pdfIn PDF document text
    • http://clumba-indoor.ru/files/files/dovebarukaz.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/03440c46d786ea6d6dc51f6f3630ec7c/kediweparopadolifal.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c7a08fe01a8c376218b4df910c19f761/90660777138.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/25940265801.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/deredipezuzefex.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607511ef8c49c---sotarakifapa.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe1c76b73f---67039298747.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/569901abf1347533472a3872e1a72e2d/riwixuxibexekisilinogos.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fd1e874b0---86727950683.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5vtik3rjj29tseob8c8uihikq7/fejunesejoxurawu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=hanuman+chalisa+by+narendra+chanchal+mp3+free+downloadPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB802 5856 bytes
SHA-256: d1f9384dd9cc2d390939007b6ad0360ae8e60020a2bda6286fc80977ca02a501
font_01_sfnt_off0000cbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD4 10592 bytes
SHA-256: 84dcef3445407f36d0acf1c66adf690f178d718f1bad296e9a28e9a99ad688d5
font_02_sfnt_off0000f053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 7028 bytes
SHA-256: 68408937821410ff8f1729745c3039b23dacdb0e2293052ddc72991cb5c72623

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