Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9271be926a52859…

MALICIOUS

PDF

85.7 KB Created: 2021-06-26 04:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7815de821f6157227c1433e745701f2e SHA-1: af702f5d11289b767bb85ddd39baaaaf74f13c42 SHA-256: f9271be926a5285959c986b1976fb68090988ac014ac5a9eed5fd3087f1e549f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to websites hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://archism.ru/uplcv?utm_term=monster+hunter+best+insect+glaive+build
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/b6a9713a5d7187fdab38b869ee97c1ab/mivojasodex.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088716157d8a---lomefowiwogesikutepopu.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c0a671dc13255b1e1000dad035b4abb2/rafuzadaduwin.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/d92061ed40bdb6f84c5c611a03d3976c/vumupoxibo.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f94210ea1---solegaluj.pdf
    • http://angarakshaksecurity.com/userfiles/file/42642695876.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d16dd8ae9a---560214562.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beafa76ef1e---witexulofexazi.pdf
    • http://balogmihaly.hu/UserFiles/file/kiponizakewitasenojo.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160859d0dab1ef---tisarebo.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/5633392013.pdf
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/kuvulegixo.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7e6b1167---58341772262.pdf
    • https://pointswestliving.com/ckfinder/userfiles/files/76519638529.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607349f3d78bc---sunazewop.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c42bfa2e580e1508fef89be79a4ac066/mogenami.pdf
    • http://highendschmiede.de/highendfiles/file/14631128725.pdf
    • http://www.aluvascientific.com/UserFiles/file/xegofujukibukokewosibelov.pdf
    • https://businesslife.com/content/files/28088389152.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079d7b27d734---98173190657.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/293fabb8b296c77e49099928d0d52ef4/70100105013.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/o8eugvlaqlkf97us5pd929btlo/zimozerufop.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c782eef698---vafejerepifepupabulu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 16792 bytes
font_01_sfnt_off00010233.bin
bf9f9ec9c6586e33d4055080fc53c41b3fdb041593a65ea6ca2574c168082f41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 10948 bytes
font_02_sfnt_off00011b58.bin
5546e6f1aa1a151102b2d199a830c7682b016d3a3e84d786ccad94cce614511d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B58 16944 bytes

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