Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a81dd79c74e3a6…

MALICIOUS

PDF

76.5 KB Created: 2021-08-06 01:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a90c44cff222b77ef231b95457732b18 SHA-1: e38e1aad7074410d9f36133a9848f2907de10117 SHA-256: 63a81dd79c74e3a63aa271da7817589deb109559842bf483b12ffadd0e37edc3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document's purpose is to trick users into believing they need a password for an archive, a common tactic to bypass security filters and deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://oniceh.ru/uplcv?utm_term=pack+roms+neo+geo+espa%C3%B1ol PDF link annotation
    • http://hungbuloon.com/media/ftp/file/11870239775.pdfIn PDF document text
    • http://millecolori.it/images/file/jagilufonodox.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/bukixokererilenozeravum.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/tovobukarokitokavunik.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/36ffc49f556ff258a168f3afd7fe0aff/55707754949.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/99542886377.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/xanasidaxip.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/suminubuzikafokagim.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9e2c1e6a1ce3259aab224e3662134d71/98547456144.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/25449020035.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078de836ef10---26705915046.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/53862377913.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/j3kkkree9sd13qktckgstda99q/78175234715.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f0b315b85---sulebejo.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e641b8503f2---rulusi.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/25513539118.pdfIn PDF document text
    • http://vhktn.at/images/content/files/kefabijidopetimefedex.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/042ff19b87055fa673dd8e128930603f/74823031889.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/40640202444.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/529eb3b395307364586502ead8d6b362/64083974527.pdfIn PDF document text
    • https://btegypt.com/file/letunebezetat.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/25097177141.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/dbdca24a8e87a365f40fa2eeee781459/48045575496.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/3cd5b197d2bdd2bdd4d3c2f4fa8dff97/98855011776.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_off0000c1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EE 18432 bytes
SHA-256: 06d05388d6e680a4517faed4467292e422d2badd01f0a4620a4382ec7f3d267b
font_02_sfnt_off000109a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 10828 bytes
SHA-256: 4cdcba09a7a32a7bde4512223ef579a21c77cc416bfc7e863c7eb8f5ebe537ea

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