Malicious PDF — malware analysis report

Static analysis result for SHA-256 713c00145ef4077e…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 22:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f9dcc5768b573bdf531755fee8884cf7 SHA-1: 1d9b204f21249a0265a29ed1889bdc11ce778ad3 SHA-256: 713c00145ef4077e490bfd640a850a88e6b95b7c13ff21f443fa4545c98de7d5
156 Risk Score

Malware Insights

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

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 various external URLs, some hosted on compromised CMS platforms or disposable domains. The embedded URLs and the nature of the heuristics strongly suggest a phishing or SEO poisoning attack pattern, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://philabc.ru/uplcv?utm_term=oxford+preparation+course+for+the+toefl+ibt+exam+pdf+free+download PDF link annotation
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/81066014509.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/fenukamus.pdfIn PDF document text
    • http://dges.in/userfiles/file/kupunebizajar.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/pafodovudipope.pdfIn PDF document text
    • http://flexa.cz/docs/file/73391633683.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae74e0c18e---suteli.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/nokofela.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/weranefurakamavudut.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/un51naet0dmhe62120rinlfrmu/76602513012.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/d4a4165aec5fd0a3efd74f271b5fc599/54754556201.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a3cec2db3---87516007917.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/mujugexobadakikizanov.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/96588926899.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/kadarowagujo.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/44007775274.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/pasuxifonibirotexumenivep.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/tulotawuwe.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/nelusexegile.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/38r3anjd13n6js3ur08vb1u4ge/35833527437.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/fuxoziletelelaton.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/75129772270.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/77314093662.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/28140189475.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/57910722217.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/bukekoridilosadizizaga.pdfIn PDF document text
    • http://artospace.com/pics/file/dowalik.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_off0000d8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FB 11340 bytes
SHA-256: d7994cf6c756aa79da234bef7de7c50b85fb6ef06835c250ce1eac446bf6644d
font_01_sfnt_off0000f348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 20060 bytes
SHA-256: d71cd1991376fda38e0745b382c23cace52e7f144a6973a78c7b2f6eb0403aa5
font_02_sfnt_off0001271a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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