Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7eb77c1df26e784…

MALICIOUS

PDF

103.8 KB Created: 2021-09-23 20:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ecd9a0cc0aae43858b78ec914ca3a5ec SHA-1: 8baf98585acf49151e6d51cfd3d965fdbf21656e SHA-256: e7eb77c1df26e7843e0e4a59f330f2450e02776c4cae392976d121e616974ea0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://coretry.ru/uplcv?utm_term=alice+in+wonderland+summary+pdf PDF link annotation
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135092b7a81b---5070885639.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/96118819548.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/butazogidetarefekavetari.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/58770910720.pdfIn PDF document text
    • https://krusomying.com/data/file/57898906081.pdfIn PDF document text
    • http://kesifveotesi.com/files/20015063422.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/2080897221613b9148b851b.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/m80dfv3828eia6ind5ulq4u58g/10878939753.pdfIn PDF document text
    • http://baove24h.org/upload/files/19451249844.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161382e95e81ac---mefoselinegudiwadugifunu.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/zetewulegumepupitipexufov.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/jabotagi.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/55781831131.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/27809766388.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/degefupofarobeworun.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/07404d1661d21723048fd2a9fb77d572/42080683824.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/donoxuzof.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0fe86c482---65899931412.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/manedudirutosavim.pdfIn PDF document text
    • https://beautydent.hu/editor_up/fagulubopazebajusekorepi.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/77711529935.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614164069d036---69383543254.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/38184200794.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/darulovefojibulibelidinu.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/dagenigof.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_off000129f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F2 20708 bytes
SHA-256: 700e0286250dcb71735074323dd5f13d7894359d07b3c44a202c1297593a4cba
font_01_sfnt_off00015fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000177ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177EA 10964 bytes
SHA-256: 7c0d3b4013e8b3c0f64fc6799a6feaf858b54fcc02fef5cfa1b1994bd850f692

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