Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef207512c199e4b…

MALICIOUS

PDF

104.1 KB Created: 2021-09-05 03:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 13fc056bf06527e873c43b84f60c4f47 SHA-1: 623a261779c940588ea872282cc44111fc8bbfc8 SHA-256: cef207512c199e4b70be6667f94aa5f2c56d2fdac9ba822cab58c0a31a5bc5f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://huntic.ru/uplcv?utm_term=gann+masters+technical+analysis+course+pdf PDF link annotation
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/7djafbe728mnr8hep8cod23k6f/bekuradijabirolekefi.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92dc82d6a---85591742667.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083b14952fdd---34287527554.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/1059081507.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/38820040406.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/tozikijufidizikamonez.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/40463992867.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/60173975368.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/976afd7e93d2e4b0aa4c50ca2ff7fb3e/bodubejamizoribavikowu.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/91096268190.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ee58ac0ef14f16e8495229501a06703c/5590424343.pdfIn PDF document text
    • http://temple.mo/userfiles/file/28193605615.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/parijebeguwovaduk.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931c83a5c18---47755001762.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050304474273499.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080905b8cb8e---bezukuduzigene.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/n8026ej24ijndq12mkgf93j2dj/xuzumorinisawig.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/b15fc2b3a5b5bed4edeccc077f839b70/vejelixabeloxakon.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16090c372a383a---56518353582.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/17893080051.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/nisod.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/fd3261493d9d8afb37ad65badf8f43cc/36012426540.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/d572g09lf5dhon0j56u7p6ra0a/xakab.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/53349972913.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/16923606294.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba196ea1e62---36229872917.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/44989854503.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_off00012b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B58 20408 bytes
SHA-256: df9ad9c72dff87591c8959f10ec7f9edc338c960a7c7b3b946cfab73c7702928
font_01_sfnt_off00016054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16054 11140 bytes
SHA-256: 7745e3f337c871901abac9ba81b2128b0663f5a16a626707a3735b1809ac9d34
font_02_sfnt_off00017a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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