Malicious PDF — malware analysis report

Static analysis result for SHA-256 c025bbe30763b2db…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 11:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 17037c41636b29b768547d3e34b406b7 SHA-1: 597e1bab9a66fb2ff2ca8287c7c00b3f79754ce8 SHA-256: c025bbe30763b2db5181550c4a0006cbc1a5cf227e9e86627f67af263104bae1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and a link farm pointing to numerous external URLs, many hosted on compromised websites. The heuristics indicate it's an image-only document designed as a lure, likely to trick users into clicking malicious links. The embedded JavaScript and the nature of the URLs suggest an attempt to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://nomylo.ru/uplcv?utm_term=hack+mod+of+8+ball+pool PDF link annotation
    • https://towa-aaa.jp/userfiles/file/xinaposamejatajebewogat.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/40484290016.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/wovajafegutobaka.pdfIn PDF document text
    • http://belovosushi.ru/files/xekutawoxixuzafagomubof.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/30112070195.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f8c920c91---kozufumibi.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/sizifabodumona.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/87465894552.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210925232221.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/nufimezamakatakaniji.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/7221af4d84335244a4c3fd5cb96c79ce/japosakumukiwisoriwufi.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/jajiki.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/zepikugo.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/dajuniruz.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/gabugemitawifu.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436252ed360---jamujojimamadu.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/kevenotikifawipo.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/gitexifovofarosuwolu.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/duwofujadamigejumuvole.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/21073573038.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/sewufoloseb.pdfIn PDF document text
    • http://fpole.ru/sadm_files/29998112547.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/70082012451.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/jarebaganexewuxibuwu.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/godifabiw.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_off0000b2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B0 10520 bytes
SHA-256: 4e900d9018b4789ec88a5efd0cbf83eb7fcc00ec671a76bf3e5704601eeb3b1f
font_01_sfnt_off0000ca64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA64 14216 bytes
SHA-256: 7a76162c57225c0572a0848c833bf18d6cd44815036dd673318d44f57a86dbb9
font_02_sfnt_off0000edb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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