Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec369dbc4bb4ddd4…

MALICIOUS

PDF

83.1 KB Created: 2021-08-23 17:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4b856a8f02dff36d55cc189af86cbc8c SHA-1: 5be5798c6f947ed24d0c50a393cd83e43980c6c6 SHA-256: ec369dbc4bb4ddd48e332294657648b186cd5c783095676f168cba371fb6ace7
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of non-clustered links on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=apa+citation+multiple+authors+in+text PDF link annotation
    • http://studioindelicato.com/userfiles/files/lamorom.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/89226171118.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1227f5d0ceb01e368bfb4dc54cb87cf6/39777500707.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/gozedivasatezenibarati.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/nolenuzupemoxupawigigoxu.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/bezobidiluwulebavixite.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/53207601723.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc25e28c89---sefutinuw.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e92c8158a46---taketema.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608519117308f---14081630255.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/24123883939.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/74499317080.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/xukobubu.pdfIn PDF document text
    • https://wodgluch-projekt.pl/userfiles/75558865271.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/rozedegodagusofesowifijew.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/ruvuzovobukinuravuro.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/plq9618j4ll1mm5hap27lqtbd4/28547377381.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/tugovubisasiv.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/87840605652.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/mo9rhp4tduu2ikpj979phc5frv/rewudezaxutigogomi.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/sisavijalimajosivudub.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a26e6e8e9---veguzarofafikevukumogowo.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/b94d3ebc6eb38120a0294609b5da39d8/50903662181.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/e8774e7e68ca9e75fed010e7d8ff284c/70006872204.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/c549cc4e7f715c6c6b17c38b8930deea/dinepigatasadedutuwez.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_off0000dfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAA 10824 bytes
SHA-256: 1df89bf2e6f11abae9989c0706d69a81cde12859c0ebfa5a1723cc38205c7b1a
font_01_sfnt_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11098 16924 bytes
SHA-256: be06abe3f484020071d253de1a160b14963722622601416f9bfb34f0b2d55956

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