Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6178d3b6da14956…

MALICIOUS

PDF

92.3 KB Created: 2021-07-03 21:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6df07d8465eb2b19f8a2c02883b1db47 SHA-1: ac64120a0c8c828b8b492ecb855f0529784dc2aa SHA-256: d6178d3b6da1495604040bed859a341c0f0775e2ecbb32786601c9be823c082b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support its malicious nature. The primary attack pattern involves luring users through these links, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cochleartudaskozpont.hufiles/39875325796.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/46315354651.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/970e99f705ee04f1607f38d1fb8c3930/28951077829.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/jogejovaxoxuzufameweweda.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075617123b6a---dixudojawipo.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/dc00cdb8a41255d7147d93b07266d9a6/84527792364.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/9370889592.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c11ab9ca71c---vufopovebesenuwipapego.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/vodefasudamaginibele.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f214b191613bcf3f0d85f13cc87bd8a5/rabetu.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e28c04830---70093298578.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/wozodisudumukezaxasutaz.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/rozoge.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/c80597c8d550ec8156ac920b8b033538/gizuto.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f6bf2a347259059a1cd3d0ef39b62128/nenelutetegakog.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/letanugopadatuzuzu.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/32572568424.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc98a2e9c50---19040681400.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dvarl2q177plj2nbmrrplk8nal/36934972953.pdfIn PDF document text
    • https://securitydm.com/slicice/file/zokujarewusudajubalub.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5f70e1367---gosewilesilawexalanotukez.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/51029113836.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/lhg252j37u00od5qrufvfk32t3/54346704628.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076cd864a4a0---gatavoxi.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ghlhvg0kn8hhd5pmcrl6ds3bon/27039834129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=plant+cell+organelles+and+structures+answer+keyPDF 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_off00010541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10541 17260 bytes
SHA-256: 310b5d506f7dcfb53abed926603b0e8c30ebfdbee4c44e52a69b304c4c13d962
font_01_sfnt_off00013292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13292 10848 bytes
SHA-256: 11db774e333e4206d90fb601f6741ba3456c3b195fa1ecb72d307d56436ba288
font_02_sfnt_off00014bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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