Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a851a495d4e9f8d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 08:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1d48f14636485a3493024f69fd1f477 SHA-1: fb0cbf5f925f97642b04cb3cd94eff1fed8cfe99 SHA-256: 3a851a495d4e9f8d32cfafe98523ee2985f98bb851d764766110ceca83af6007
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to potentially compromised or disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content or phishing sites. While no scripts were directly extracted, the PDF structure and link farm characteristics are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://hengtongrongshang.com/jingkelun/userfiles/files/20210830182828.pdf In PDF document text
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/58831366662.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad14776e7a6---83969272358.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/70589668373.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/13200302987.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/wojabe.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/situjasonovupuwegikinusa.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/vakejumu.pdfIn PDF document text
    • https://jensbrode.de/files/file/63258763726.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/bidatojujajozidabixa.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e06bfa7044---31217641101.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/fjt7jh93ktsnpk4ujvk93b4epa/nuzewegukupu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/44k85hdjmo7nn9khhjobr19ud2/latefuxekemuxoda.pdfIn PDF document text
    • https://angkalaris.com/contents//files/tufononaguwapusifar.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/0b18593d01aa0cd90a0503bade8bc99b/tifurijituzetebu.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/18272161236.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160770c45bac57---rizojimixuvo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083085778be2---12230605742.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c84195047---84006707893.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ac2bef10d---wofevatotevaladurivosaw.pdfIn PDF document text
    • http://scsychem.com/upload/files/dexire.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/63236585065.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082b3aea4857---forasopexole.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611619f42b5bf---sibiximosusuzugebitoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=grammar+for+writing+grade+8+teacher+edition+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_off0000d363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 17672 bytes
SHA-256: dd4a9c46e46ef7cec24021a6d39817903b2850824f0f2c4f2c2dbeeba3aa3d06
font_02_sfnt_off000119ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AB 11184 bytes
SHA-256: cfd85edb381ac2380e882252c3ec0be2ad4dff0b17a76aa97f41704ce2e88b98

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