Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7ba1bf28ff7af4…

MALICIOUS

PDF

83.6 KB Created: 2021-08-19 11:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 448aa8ef02fa1020511844f744c3329f SHA-1: f5ab59dad41c99ef301ab9ac62f5c5a5c798afcd SHA-256: ed7ba1bf28ff7af48213df6f34191b4d6737949e2fa48e07e50e3bffbd654515
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised CMS platforms, suggesting a phishing or link-farming attack. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing, aiming to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=examenes+matematicas+4+primaria+santillana+saber+hacer+pdf PDF link annotation
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/c6o23h4d1jh0u42v89khu8ituu/95009829434.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b125105fc7d3213c2690d3699fa9ec64/79153803204.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160832e6175789---gewaxamixonejubakefemidi.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/kadigamewuxomavovufemumus.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/tixedikurogipiwisafimudiz.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/tuxekimibumewi.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/9894134640.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/paverisaneketazojezowu.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/38541215275.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/5f6656922e9eb28e9291ab7cd7b5b777/lipumenobinoxe.pdfIn PDF document text
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/25847858494.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160834f7bcc075---fasewosepuxibo.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430225546999896.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/duralekadavoz.pdfIn PDF document text
    • https://shiokuda2.com/contents//files/varikoz.pdfIn PDF document text
    • http://beiks.info/public/file/74456612286.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/92488933328.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/wagodokixajabegoju.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/kobowowezumirideleves.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6478df0eafa66956bebd75f1fc5c752f/wegosenifawuvux.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b6be26121---jusukaxarojojufifenulet.pdfIn PDF document text
    • http://kco.su/userfiles/file/51382762653.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/2d1ae52abf951bf9c95010239045a34b/wagidevexu.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_off0000dea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 11068 bytes
SHA-256: d2c38cdd5354dd982e3696262907c7d37f3f5c1b7d0567ffe355a25bc582c1a0
font_02_sfnt_off00011010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11010 17732 bytes
SHA-256: 252a3e0459e04f1196888da2f5513208ae57ff92b794e416345924b5ce6ffb5a

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