Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c621e371951b07…

MALICIOUS

PDF

90.0 KB Created: 2021-07-31 11:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d525028834f3c1570b52a8affd397e8c SHA-1: 55c7a2c406a29d6cb4681c87d181f74274027d55 SHA-256: e7c621e371951b0730ad46bfcec168f7afd4b6dc2aaf13301fad500057ef31f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via these links. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=ejercicios+del+abecedario+en+espa%C3%B1ol+para+imprimir PDF link annotation
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610439196649d---11533847752.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/d0a102991de133f382596a43e3466d73/gonubixibedotusiwatarikom.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/ralubapel.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce65c44246---ruxifunalotuzavibet.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/63767392243.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dd5b3a29a---87611198072.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/vemetezuk.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfbe612fbb---26880744609.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/h5sm1b4vkednqq4uve1v4vq3c7/59256550825.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/10699858922.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/zigavumaxijatases.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/8310894406.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202107100100569111.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b20c8d2acd0---wivevigeja.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/73074746094.pdfIn PDF document text
    • https://mmszke.hu/files/file/miturubone.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607527cdb4fe1---18862785918.pdfIn PDF document text
    • http://eramaztravel.com/bot/ckfinder/uf/files/voxegopukugobuzimapa.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/1396931f5532192368f917f7b1f89d80/vaperuwegokagiwutapa.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/seziwerakezuwegijezavodof.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/hc89qd8nio6uug07k7ur1pnfko/segetedi.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b0dd46841---46475656300.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/6ff8f5a77d41719907574b260fc7a5fe/mamiriputizulanugibexik.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0079ed2db2fdcc8076ff535dec6c5ad5/xolinifukodo.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/muzuriban.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_off0000f6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF8 11036 bytes
SHA-256: 068bed2056fbb249e159309cad2d9135cec94bf827478e95fe75d7f1d4bd8494
font_02_sfnt_off000127ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FF 18144 bytes
SHA-256: 24f791eb6e98512bbd62edbdd93bf18a3be4bc59e641913cf009f4a81daaefc5

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