Malicious PDF — malware analysis report

Static analysis result for SHA-256 5234c97a6e109e88…

MALICIOUS

PDF

79.3 KB Created: 2021-09-04 01:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4be64c6a025298769f71959aff6229a2 SHA-1: 9cda9d1764cf17024addbf01681d1091e4b6534c SHA-256: 5234c97a6e109e887abb76b1d3c4e895821f523a6850b1deb903661e85b2c03e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it's part of a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's a phishing lure or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=adios+muchachos+pdf+piano PDF link annotation
    • http://vhktn.at/images/content/files/xawawiwazimi.pdfIn PDF document text
    • https://2acontractor.it/images/file/21006926458.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608f51ff63eb0---tigudogejofo.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/rebizeledupiwurexowu.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210814093437636.pdfIn PDF document text
    • https://ms02bet.net/contents//files/nodaki.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/jomagorisunoj.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/71204778091.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/552afcb11ea3a5c5a59a0e4ae4e276cb/73300796296.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/bizezuseso.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9721939e2---mozew.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/segowifawogaraleni.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/53b953e370126c699cfb9c9f6be49625/rorowomepajodaxigiki.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160793653a45d4---2494116221.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210904053823.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/93372405457.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/c2fb0ed1f0bc8a8526d1ecab7014eba0/32230765749.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/bopagukugejemotawezoj.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b13a3a88f4---52019545885.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/de71b46bb1b8540d4bad7edbb2d8f048/xadaxutazaf.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/96118523581.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/82692038372.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/6775806860.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/4a1baf001a0d3fd3c0a6b6a44dc99fb8/43885465474.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_off0000d10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10A 17852 bytes
SHA-256: de7911fc20a9199164efab83b9a1ceee50e8939e78f7d79dd7ada9e73bfbd752
font_01_sfnt_off0000ffb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB5 10588 bytes
SHA-256: 90dbf7ea20c680231ac76b7660056bef350722e067687e77ee7f9b0f585e77b2
font_02_sfnt_off000117b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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