Malicious PDF — malware analysis report

Static analysis result for SHA-256 770b012ed6a00d92…

MALICIOUS

PDF

88.0 KB Created: 2021-10-05 20:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 03ce5acb15fc782db172354b269eb8b4 SHA-1: b0ceac0b5d4176a84146f84974ce1810ec1410d2 SHA-256: 770b012ed6a00d92b28962c21ebf46be1b9dd87e23f02e8e3fa66a6ae6931f1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://peoplesmodelinternational.com/ckfinder/userfiles/files/wewor.pdf In PDF document text
    • http://ttccid.com/userfiles/file/pirulodomiresibukalajole.pdfIn PDF document text
    • https://isleo.com/i_photos/file/winisifaw.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/2796981849.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/82228175938.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/rmtukosf039nld1ti29860ofri/gokorubiguxokafitixelaxe.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/18481739947.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/38574083128.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/tukojexe.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/95146360547.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/rowafedube.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/2606766119.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/n7n8i43vcsmba5ou9i5rtl8m1t/mirabeka.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/fovivazumito.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/rimusevimunuz.pdfIn PDF document text
    • http://asustainable.com/global/file/resavagefixo.pdfIn PDF document text
    • https://fobh.net/userfiles/files/86282024764.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/02d965e4c335d04cdb7d861127086838/66878429969.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/fokal.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398e5f91fd7---52118979640.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/zoramuvodidupijejapejelos.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/89571644905.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/82412724048.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/zukejifomewonerev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+add+digital+signature+to+pdf+macPDF 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_off0000f1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109ED 17584 bytes
SHA-256: 5e629de1c70fdc26682efff8f6cc7d72cb5d5e0faa768ad938a232ea4999ba14
font_02_sfnt_off000137e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E5 11140 bytes
SHA-256: a2d8c147d8128f55a5c176b216a3869bb5f0c5bb9be12a28ef8cabbfc9770d4c