Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3168da79053a845…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 05:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b813b405a84930ba1c64761a4405de0d SHA-1: 7505d82daaf8053138d5955cf7c5f1b7a000aea9 SHA-256: e3168da79053a845dd7a0f51d77a97db13f01e60370daa4e19c27f8c024e355e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://ikra-ekb.ru/files/fckeditor/file/dedapala.pdf In PDF document text
    • http://erex.hu/upload/file/16517109468.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/dupajomib.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/vigawapunapegurofulavafi.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfa474c4f4---58629527817.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/444e075513f88aada6f9c2c5e015f5b1/funilufa.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/gaputiverepitugogafevak.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/35864357084.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/tomivofamuzezexerak.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/076198157c015ae460ba15c139ffe9fa/sixeluvobibafepedadefal.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/tarenenamopojo.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/kuxoli.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/9a323f01466cee41de2996b10f4276bc/99121747696.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/21657880414.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/rumipebelazelexo.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/76267277a6120976137ad37b5bc49903/94876718026.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bec26921a9---46929567984.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783f79d504b---vedeniguxoso.pdfIn PDF document text
    • http://riversedgefm.com/files/file/jalexitemuxepe.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/xumokizivuzibu.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/zared.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/sujejamalojizi.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/gerakisolulumuwazowipofob.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/kigenusarabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=fun+writing+prompts+for+teensPDF link annotation
    • 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_off0000e041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE041 10656 bytes
SHA-256: 5b10363fce86ba843d1b34f6ab37ef78fd22e9b1586353c9b80cd231b2df6016
font_01_sfnt_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CB 17828 bytes
SHA-256: 210ef23d63900087d8dcb3b139d6ba2d73b8608b2961ec08f6846c4697416ada

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