Malicious PDF — malware analysis report

Static analysis result for SHA-256 eefc77a33d68d232…

MALICIOUS

PDF

126.3 KB Created: 2021-06-25 20:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 11b427f36650550856fc505c1b83ccee SHA-1: 1b4eb8b5538495973b3a9a0df692313544523e03 SHA-256: eefc77a33d68d232e7da5a04598f516375e3b949b4ae7e0d45aafcfda7f0d759
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely serves as a phishing or malware distribution vector. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to exploit users by directing them to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://nomylo.ru/uplcv?utm_term=ghost+in+the+shell+laughing+man+logo PDF link annotation
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/isa4l76bqd3ohivth25dkrcjj5/bojubezife.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/zelizedepibagufuniva.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/2e96a84b02db1b6dee20356512fcd602/48291240980.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/al26gljtv7me26gei1kvrl69ae/92207582089.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/jewugov.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8b8cb2d8d28ad8ed0a40f43d5dd3c29/13619942395.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/49441320135.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740565a6762---8082520875.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/fofudabamutupagukalel.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qhoot8hqio8as3tqf12cn9qk04/xamorusipazijofugerejun.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/cb2f238927ff89a6f030c734166a3305/teneni.pdfIn PDF document text
    • http://babamoleskine.com/files/file/gepedotoludikun.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/e44b73d5cd8c1f73cc4c83c763f707cf/mowotinufojenebomurab.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/d0c3c4fc0a60d4bb43e13b004149a108/84427969399.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf65784eaaa---gezilamod.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/mulavubupozenenikem.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ce45uj8ed4kihprdnsc5sq2em6/zeverezuxofopifirefeleri.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160bea9cac8f4f---17807075486.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e33923a533---10018135091.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/konomabovisesovarilav.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/digutuvosozim.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/37c597b4e5461139dfe850f39d3e9e98/lufoze.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/vutimi.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/jesibexodigidakoradelefim.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B6E 10592 bytes
SHA-256: 763d8b53dc55c907087cbd5162189c2dacd87bd99264c88488986cb6cabf2185
font_01_sfnt_off00016374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16374 20824 bytes
SHA-256: 1b0f8871c74117e849947ec2513f6826a649373992800b91b77ae119f69287b5
font_02_sfnt_off0001a21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A21D 18812 bytes
SHA-256: 21082ed737d401d8e075d710367e78ae2b0eed4d47fc49013ed772705e14a92d
font_03_sfnt_off0001d2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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