Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef497b0e6ee0615c…

MALICIOUS

PDF

76.0 KB Created: 2021-08-18 00:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fb16c253f6ecad48e8917bd21ca0fceb SHA-1: da50f026fb1638e823300b3cf500df9b503fce22 SHA-256: ef497b0e6ee0615cd403436e99171785660b662d1bdd6e216cb67b398a80d6cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://chcial.ru/uplcv?utm_term=piano+specimen+sight-reading+tests+grade+5+pdf PDF link annotation
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087774314f97---48388546077.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/76vv9660c9k5a53u0b3dke3gtb/wilobokuwe.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/xuxatowusi.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/rupevuragunitu.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/89319216638.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/87497562283.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/94570416544.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d49bd974b2---1042261475.pdfIn PDF document text
    • http://surtek.biz/image/files/20150120_083651.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ssfh1mba85ou46hftm6aaakqbi/sedosivisaga.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/d45a71e096c21f9da54a1f1868843f7a/87792793080.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c71e38e8bf5---givemolaxo.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/dowefagomubogiwekoxofata.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/5841c34d34771c7e8529e1a460e509ca/16821023517.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c689a128636---73699336335.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/sksbjrlguivjeht82s4purk1s0/dekitositedataluneke.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/62197b7f919f600df4dc7593edefb3e1/bugidegunozapupedejuw.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9050dfa29---37360863188.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/46902150325.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/favitusasivelofuxez.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3a1777a73---lawopononin.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff58f9bfc90---79674404042.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/69092768619.pdfIn PDF document text
    • http://delve-cr.com/uploads/kiwobepoguwolobidaramaju.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/24249728145.pdfIn PDF document text
    • http://artattack-concerts.de//files/file/52417347294.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/70538842310.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_off0000c50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1D 16488 bytes
SHA-256: 23d9ed9653d47a6e048cf3fc154f5233ad9136c6570dcb0fdc65fac5c7773fb7
font_02_sfnt_off00010831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10831 11192 bytes
SHA-256: ce66a48e6ce1057450a317e9df897b7e5ef407625c6164284342bc4fee0934f8

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