Malicious PDF — malware analysis report

Static analysis result for SHA-256 53aa7c73f263f6f4…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 22:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 61abdf9c4aa0b1a99bd6733525f21e76 SHA-1: 9a93eaa31c0fe3c271e45d702cc8748f8499d7e6 SHA-256: 53aa7c73f263f6f4cb9e17ef457583c13c101a1e3e83e49ae6847c87987581e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely serving as a distribution point for further malicious content. The file's structure and the nature of the embedded URLs suggest it is intended to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=dessin+a+colorier+barbie+pdf PDF link annotation
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/rrnsjl6d2ogjmmkq6s85gs0107/77898199749.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/be1baa744ed0cb82023e3322da93d840/57729074051.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/mepunegimuwez.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/82705721639.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160953c2ca0fa2---45748570472.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef3edcfa2a---dujokenezetilewawu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608469cd61241---wizer.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/41724218124.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6339db2663---fapureludejadisebuz.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/30652521564.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/tisomepabogaxedoziwine.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/kagotemekir.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/zazibudevijadegupefat.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffd3390f7c---44940402671.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/0d59e8b8a8b10992264a6c1c4fde0eaf/riradixubove.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/83114546520.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/17361128258.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160872235b8479---18252881292.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f07af164aa80dc548b48a9601755b494/gorezizisoderalibodez.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608c492057f0f---47430887070.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/57370715.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161196fff12dab---wazadilak.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/watizipesuwoxarolevanig.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8b6633d28---dedavijeweribijisiri.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/61351195769.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ae91bbfe8d---bisowa.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_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 19148 bytes
SHA-256: 626ed9c09064fe98aa5d6c4b35b265e489c8c7bf9e8372d756015c33f0ec06ad
font_01_sfnt_off00011048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11048 10656 bytes
SHA-256: 3cbb8da69db67712cc72b213f72bc95b5fe4b1b6b264ca31f4731d885ee6bec7
font_02_sfnt_off00012887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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