Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f22a74dcc9cf25…

MALICIOUS

PDF

88.4 KB Created: 2021-07-13 03:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0d1a821ea4eaa10d4ac3b6da30b46e10 SHA-1: 58a917b360b4a9069d60552ed9c8afe0c3a1bb27 SHA-256: 16f22a74dcc9cf25b661b901dd3c9e005de0ec6b107ae8f4652a55b39d6e5a07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://rioairporttransfer.com/ckfinder/userfiles/files/kinusuxegipej.pdf In PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/movidubiw.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210502124439_248651742.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/81db47c6bd50664cc0ab5ded0c7f27a6/lujaregirozop.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/budixumoxapifokagufijoxe.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946d7e38103---9484615788.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae20486522c---zepitepoxefuxowuponovox.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/tujagowenunuvorevi.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160824d24509a3---17336463627.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a38035ad3---81786479594.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/15887de91854c69e043e47fd0a0e8ecc/latulopovegivamidijudal.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b4ffb1a333c90e35f4792828943feaf8/sokujonop.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a51c61d77e3---sawutixenotunup.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/c8390b9fb851a59e776fc0a895d2cdaf/nobipego.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/dosobeze.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/7950576015.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/eb4d31793674d79382b55384202599ad/75660051320.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cc0a7ee1ef5cd7bf84a2cc7db35728ee/18030268395.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/risafixak.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/16292657165.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfeaaa7639c---majopamotomitum.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce06f4521d---41918345154.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/50649417449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=hifu+facelift+before+and+afterPDF 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_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 10532 bytes
SHA-256: 8be73818dfcaba3e9a72197dc4ca99f676677b39398ada91d7cd7eaa2dc2c95f
font_01_sfnt_off00011005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11005 16912 bytes
SHA-256: 51c9b240b1b1e08a3ff8104109372996e80b3d305885d9e51ee500160e62e609
font_02_sfnt_off00013c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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