Malicious PDF — malware analysis report

Static analysis result for SHA-256 596cfb832c48cb94…

MALICIOUS

PDF

91.1 KB Created: 2021-07-23 07:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2fd69325b70f4da20766efa9a2ddb603 SHA-1: 5e1caab41b888578394338a742c44c005e53cba6 SHA-256: 596cfb832c48cb94e8e88ee433f601c3b716865afb4dcdc221f20e1382352175
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the nature of the link farm and the PDF format itself often implies the use of embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160901254de5e1---55630824010.pdf In PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/cdcf5e46b77aebe1ce19332a67d27a6b/milibujomorovabap.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/afbba6c2733890c1b94a56d1af7d6427/27514855962.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ce5363060---kudiw.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/8289917033.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/271ocgt6eur3o8su3t2hfpp9u3/devuxefejuk.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160964ccaf157b---bitedaxazorawirege.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/29134495798.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/newago.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/86220839266.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfdab8ba2d---92517438770.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a060dd438b---xunipatasabit.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098ca8d10120---79825303948.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/bq6555iau9rduvjhvvo5qhaigb/82470326186.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/48404851890.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/23507400482.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/kilekuluv.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76876b0454---pamajumavoraba.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/55441296467.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/dovarowivutev.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160967e2b961ce---6335353191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=night+before+a+racePDF 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_off0000fe56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 10416 bytes
SHA-256: 1c60bc8b5f2f9a941954bf4d7653578503f0a226855f9a0751e881e1431aafac
font_01_sfnt_off00011614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11614 17672 bytes
SHA-256: 15c9d82db700a21e055bfca1a1976c67213980b2d9bcc8bc2a178afa5b794d6e
font_02_sfnt_off00014494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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