Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f708346f369e27e…

MALICIOUS

PDF

82.1 KB Created: 2021-09-15 23:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 05d22306152d367750f3c053e10f75a6 SHA-1: 847e5452b3e8f236333ecef61e0433c49ab8f4ba SHA-256: 3f708346f369e27e1bac36540a4ba8556f7c2b9610159cd983b38d129e05f18d
216 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to compromised WordPress uploads and disposable hosting sites, likely to download further malicious content. The presence of a 'Payment redirection / bank-detail change lure' heuristic strongly suggests a business email compromise (BEC) or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://medvor.ru/uplcv?utm_term=how+to+hack+other+phone+gallery PDF link annotation
    • https://mimpishio1.com/contents/files/zogorojigoruwawelodedepul.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/fefijokesuxupod.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/88826333835.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/sizipopopeg.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613539b5ebaf0---18785908727.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411b1c3d673---dexajulizekunebilomolenoz.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/tudirevoxegewotese.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/fejatugitir.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/putesoweziluxup.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/xulezofi.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614102f24021c---60690873757.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/7f10f46ddb922ca80173119d5645984f/xaloregovimopuzesitazaxu.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/bopawararinegev.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/niwudigedomedalarafu.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/10989901448.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/liferasuro.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/49660153291.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/towanujokadofibit.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/pajaxigu.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/rirebuwuwoxuxat.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/zopasosipejokepawovuz.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161398d1118f6d---90686056034.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_off0000dbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 10676 bytes
SHA-256: 03131fb8028e8667855055ce7923ceb7e7a2a659037d2ad5f2c25ddc165f389a
font_01_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 18000 bytes
SHA-256: 2959dfa71fb303a351e8e1a73a182f86736632baa83c7e4ce945e18df5f2285b
font_02_sfnt_off000122c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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