Malicious PDF — malware analysis report

Static analysis result for SHA-256 8626edce9ef221f8…

MALICIOUS

PDF

114.6 KB Created: 2021-07-29 19:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c8e5b8ff87c7dee7e70782368338902 SHA-1: 5b87679c2ac23e47acc5122af450c97f7b32c831 SHA-256: 8626edce9ef221f8e9ae8def3dc343180bab5b0ea7e7123f52122a000afca720
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a2da4f752---lurige.pdf In PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/0afa71d156f385cd293891f88abee2a6/57094304120.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/75651079107.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/fixobomevegudarus.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/d2567bbf8e733473491e7bf65a6d8153/57251875495.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7ccb684f---57625912630.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160be88795e4b8---61766459747.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077c1c4dadd4---82980752721.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/69447d82be3e99da96ba96cb2fa46efe/visusid.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/21d62dc1d2d6efe1fbca911e8e8faf6a/jorowopumileru.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/82186050427.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bad8fc5b9a---kekokuxoguxapudejiseka.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bf05b68f5---30609422043.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/eaacd5b4926fba84f9bf1508bc821a1f/nesigipipakesibapowesu.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/dc1769cd738b1c4baf0020ceb0c8008c/kegajorolekoferujuv.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3b990289b---56159581409.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/18945093519.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16230679164463.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/munijewosusatasawij.pdfIn PDF document text
    • http://learningkey.org/userfiles/99814903421.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/87330499784.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8d7ef36d1---jutevesiz.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c79406629aa1cd8ce4fb002d08112224/11156660363.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/dq8hq2ufjkkrol4mspr69ml6ou/bubimifilifokivokixaluza.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/pewadevuxopodolon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sodastream+cylinder+refilling+adapterPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000142ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142EF 18460 bytes
SHA-256: 0236e1bfa689acc603fde975742e563cd895c765bb68b0a650371f5257e67a9a
font_01_sfnt_off000173b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173B6 11152 bytes
SHA-256: 9cf3654bbd7297918ab6266f2ba27b9d4c5ac6b4e2e530b861fa7a05906b03d5
font_02_sfnt_off00018d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A59E 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467