Malicious PDF — malware analysis report

Static analysis result for SHA-256 592a4147cff38d36…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 11:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 53876d361f6bbdc234cee0890f853f2d SHA-1: 487b66c6e43bfb0227cc8c196d8628237a8552f0 SHA-256: 592a4147cff38d366ab9b0a73b490069d24e143135676e689d5db19f39bfd411
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The embedded URLs and link farm structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=growth+mindset+espa%C3%B1ol+pdf PDF link annotation
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae836166d54---52453754659.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/jb2m25q7sfb9q4i9h54tfd3hfc/82675895613.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/wewatol.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/885d8a9febbb7ea6c37d4c544100d99a/fubatoromugiguxam.pdfIn PDF document text
    • http://usa-ex.com/46192299509.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/74876340060.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071571c44c2b---golunetivudokepofagizeri.pdfIn PDF document text
    • https://bunianco.com/other_files/File/fagetaxenebejoguxi.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/5211e822ce85b9c89848107fb4b01cdf/nasatifejaxizumodo.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/zexowaziwufitu.pdfIn PDF document text
    • http://christopherdallo.com/file/44742954472.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/79242212706.pdfIn PDF document text
    • https://tessuno.com/upload/files/60f15f70961a9.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/tie8tug8vbe350imgktugsr2m4/84246196218.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/monuvesakidisidilururix.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/3q5e747tqpk31asvpjlo3a0p1b/wewowozekanovet.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/zuzunanomezavigol.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d3a4668a05fc2ee52eb89ef6ed0a02b4/41178711181.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f02f8a9da3---xogikitejomigitupefu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d401a6800591ec0aa04ab1189e14a06d/41440121978.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/pugesuburoda.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/134f7a7c4813d03686b84981ea01ab19/zefuwipikeropumituv.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/64281679100.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_off0000d26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 18988 bytes
SHA-256: 5330993f628535f32d99e224d1791b8709e67fc7e46b4e1932fde263e8f7f683
font_02_sfnt_off00011ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB9 11092 bytes
SHA-256: 7a2bb64ff85719f6fe91c3ae07a99071d1da75ebcd28b53820454f9d30d742c3

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