Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ccf6a6662fe2e3…

MALICIOUS

PDF

95.8 KB Created: 2021-07-23 11:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 62d803aee7aebba285253141a277ed6a SHA-1: 7658f3f98792992b33d36c6541f34967812b44b0 SHA-256: 87ccf6a6662fe2e37c0b0796f845b9a77917368fcc58471cb565f5c27d94f767
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The primary goal seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://mikomisushiwc.com/uploads/files/rekus.pdf In PDF document text
    • http://childconnect.com/swi/fckfiles//file/kokaterogaxetixarimu.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/71119075776.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e8fe63a19---sijukiwobol.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/423f187c0b6b80f43aa17fac527b033b/8778931128.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd5098d9f8---dafipakutejozekiduguxilav.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/tadutenovomado.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a19dd24f8---67074514473.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/52226460682.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925cce5189e---tiganalapakug.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/6jfthaujfuoie1b58c8kj9rg64/rexiza.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918df73a4e5---fitixiganuborakotijofupol.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e814f4ba87---82885187298.pdfIn PDF document text
    • http://ruihuitax.com/files/file/75985115955.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7e30b5e20---12908188073.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/25243038603.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/rumugorogebalesamo.pdfIn PDF document text
    • http://fxmeat.com/upload/file/796fa36d9513ebc648919604b83c777a.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210701_190652.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/2ddf0b97adfb23c10e1a90b97586f516/kizopuwiguwatix.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/15730299542.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792cb523827---wajuzidikudexigaragidilej.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aef7fb0cb41---korigojosapigefib.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074755dad5e6---papavorewi.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/labixiropalotaligogubex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=why+do+you+like+me+so+much+answerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5D 16640 bytes
SHA-256: 2d72e2edae2a70274c6c873a993953e4d70a98e68122769d7fae477f3b49e8b2
font_01_sfnt_off000128bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D6 10920 bytes
SHA-256: fb32ba60293c8afb9d4ce507c8d4d4875055b5727f99b9558dd0948c3fb7c1cc
font_03_sfnt_off000159f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F5 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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