Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bfe5a2d9eeccad9…

MALICIOUS

PDF

74.5 KB Created: 2021-09-01 10:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 32aede39137fbf1a0f73c22ae14ad851 SHA-1: 2b4884adcef952f1ab821afc23f4ecfd8c66737e SHA-256: 2bfe5a2d9eeccad90a6dd39c2eee4f857c884a455cdef590cc8a9ae285237bcd
176 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, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or scam campaign, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://coretry.ru/uplcv?utm_term=ms+excel+10 PDF link annotation
    • https://briljant-maleri.se/UserFiles/files/55650408412.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/gilor.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b0c27946c---15683580208.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb7e5a487---74023267488.pdfPDF link annotation
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d845b1a85---debuvukejuboriwejeputug.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/zaroxokagetujuxavof.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/83486290919.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/bcf1418580e4c881203c0ebd3539bc1a/wenasapuf.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/jaxexatukivamepew.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/pagofozivusikik.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/maxaxirira.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7533030545---39270124887.pdfIn PDF document text
    • http://hk-keber.de/images/file/giloketog.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/62677077214.pdfIn PDF document text
    • https://braus.uz/images/shared/file/zowoduzeratenazi.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/semobivesawugege.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/35288302547.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160da288e238d4---vopapebajeki.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/19067622825.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/793e2a8bc0631813100ce90bfbe27f0e/68942416637.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/2767ed005ade5ace75e18ac708c86a67/73878621565.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6860b0eb4---20740591960.pdfIn PDF document text
    • http://gojjang.com/uploads/files/83692932230.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/5f3cdc485a684b2c63a4dd600a18e299/76668745300.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_off0000bcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CE 18920 bytes
SHA-256: ce9027c7272f0ce0949142cc433d52beaa71076aa9814bb68a5537bc42c34c68
font_02_sfnt_off00010454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 9816 bytes
SHA-256: 0e781ee34c454b3432a6378c5030277079ed8fd76c4294550b92cba1b2c729c7

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