Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da6641758dc2cea…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 08:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed891c599e0cedc3335274335691bc2a SHA-1: 3060ca5060538c0e5c83d58711c3b16cd1f444e4 SHA-256: 6da6641758dc2ceaaad1108abfa6f4daa879898a8922355b232947f3fcc5c825
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous links and the use of UTM parameters suggest an attempt to lure users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://queure.ru/uplcv?utm_term=alepam+for+anxiety PDF link annotation
    • https://doina.md/fckeditorfiles/file/jitoj.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/c4gedlo47dhc5g0c2sm6fg9nl1/zadulupa.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/11bbd42d8e6772999a51839db2d72c72/begijukelobenanosekad.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/poketidepe.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecec38cf54---57945874147.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/2856192185.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/denikexafun.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/34018f540006505f6a9e95685fab455e/10641165200.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/27383648963.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5f2b2a8dd---61910535200.pdfIn PDF document text
    • https://airbays.com/userfiles/file/40112540661.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/10272414083.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/nekinijedutigirofiki.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/zolerawoletuwa.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/jatukozuma.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/259867849dca281c768aea03851a188c/26338426394.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/8vqcs3sasr8hihtu72hcbd0ffo/43596022545.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c833a137d---laribarorevakozaburulus.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/wadovolat.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/bituxuzidogudajeb.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/86d29d75d56651799dca95778690bc13/31299396201.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/7079b761cca1808827fa1a01f2c88684/jobinamorumapi.pdfIn PDF document text
    • http://sherylrobphotos.com/clients/56056/File/kubuvetegawen.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a846559dfa8---61656458892.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/63347021607.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_off0000dd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0A 10548 bytes
SHA-256: 0ecccce7071dc31f2a16ab91d98a281647c91112dcadb94da34ae1021b2cbf87
font_01_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 16948 bytes
SHA-256: c6e9e411e8a36c89a687c21384ee4c8420c080d4559d57f2b7e84dd578073b90
font_02_sfnt_off000120b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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