Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffe6d08059c2de6…

MALICIOUS

PDF

80.9 KB Created: 2021-08-21 03:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ece7bb13cd763a0173cfae45a25eb5a SHA-1: e84520fd1dd88a2b648dd43df706532a2b8e51cc SHA-256: 9ffe6d08059c2de62497fc6de713833d7fccbc9839397ba087cf5d0b24f7e125
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are compromised WordPress installations. The document body is unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://szolnokepul.hu/userfiles/file/80630148849.pdf In PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/67221383494.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/3k3u281nbk8bdcftl7mhvse350/74381821349.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db6724d2cd1---12967559016.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/9r1ddbl6l1e5uboedv0g9nck85/tarona.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/69994480624.pdfIn PDF document text
    • http://edgecs.net/documents/zobuxulobitexagaserodeb.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/3393332827.pdfIn PDF document text
    • http://ahchala.com/img/file/81322826180.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/79200979655.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84356de60b---98502631475.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/polutenuzipejope.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075fb0c92560---63234129947.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/43844787456.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/sisosofomixe.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/60416500534.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/51796109082.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099d08418723---94377672228.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a190c694a0c---62774836065.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/081cb171bd35fba3406b82e7e47a7646/gozumowabimer.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/ae5b3947209ad3d205d653f7dc226809/66716074173.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/33017752263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ejercicios+de+antiderivadas+pdfPDF 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_off0000d890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD890 10744 bytes
SHA-256: a5475e723fce4e40532f985ec8e49fe5a2a88d2073438d98a08bf70626bfac1f
font_01_sfnt_off0000f160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF160 16704 bytes
SHA-256: d8eefc847b2cb4479988c8c064a0a3d68a2698699e2f20a887169dc40b47704b
font_02_sfnt_off00011b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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