Malicious PDF — malware analysis report

Static analysis result for SHA-256 90452aaa91bfe0c6…

MALICIOUS

PDF

89.3 KB Created: 2021-09-03 19:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b439497df053d8c32fc6dce5a959bbe2 SHA-1: 0a28b44730ccca5ba50b324c1154772ca79f9928 SHA-256: 90452aaa91bfe0c60b1f1f6bd028a44eed537dee24fd6f36df10acd3643a0a42
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to compromised websites, suggesting an attempt to lure users into downloading further malicious content. The presence of external URIs and a link farm indicates a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=yoga+therapy+pdf+in+telugu PDF link annotation
    • https://www.seblocation.com/ckfinder/userfiles/files/88872481466.pdfIn PDF document text
    • https://dm288.com/slicice/file/zufuvuzuzutupezi.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/9b6e43fc3ee4e5fca893c742aecfb6b4/busifupelonudu.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e0aecb705---45013377113.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/28179863987.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/dojezigopadatugedowuz.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/10ebf6fde1ca4704e215896675c3a681/wolowixegire.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/6942299507.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/fifijawadabixaji.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/91705194865.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/39022927286.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/96638770572.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/94680710028.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/95837465323.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/rhho4sjghiqmfsglqeqq34gsk2/nuvajuvorewufuranuvi.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612c9eb78015f---fibubajifane.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/vaderiveguwalokuroratabe.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/babafexu.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/31894472362.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f1b5b5fb8---jusafojajokelazedepapose.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/68801482275.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD663 20296 bytes
SHA-256: 1443ffa3a0f1f702549ae8df0f412f5fdc46f350e40775270e617481ea22f51f
font_01_sfnt_off00010b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B08 10808 bytes
SHA-256: 2c2c91edf85579c0ed99a37738bbdbee2dae390f47a12bc3795c7fe487634bb0
font_02_sfnt_off000123a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBA 17896 bytes
SHA-256: 178a5c4f086b125f325d1e8237c26d14cab34bb4bd0220d65151e120779aa40f

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