Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7c685eca49912e…

MALICIOUS

PDF

101.1 KB Created: 2021-09-19 06:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 04fbd8bbe64ef09fd1c8e02a3282cd1d SHA-1: f27e7f83556f429581bb6a007a714aec3f3be6bd SHA-256: 7b7c685eca49912e513250a1ae7cb77bd147f3bba9a61fc9fdb21eceed1b5079
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/57642957146.pdf In PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161441425cdfec---zedasoduvow.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/7q72gj0h9ue1p07cjf2avhg715/pomakamerupatuwo.pdfIn PDF document text
    • http://xhzhengli.com/upload/rifewupukekur.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/pepawepu.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/72699126218.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/jobatobeni.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/jotesovozuwukigobipev.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/74101272559.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/bilowa.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/pefunene.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/72539392620.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a686003c18---dunefenogubovexux.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613a1e4d88e8a---61263781857.pdfIn PDF document text
    • http://asja.ua/userfiles/file/sekezikavokuzefunoz.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462394b23a4---ladovarinexurizamifurew.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/didubofugukuwawoxix.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/vetukazewebilefumepab.pdfIn PDF document text
    • http://envigest.cz/upload/file/dozibo.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/48941502917.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/16551838008.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/42378252209.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/zosuma.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/c5218387ef68907e55050313f5102145/dakokalonerirarugiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=whatsapp+download+for+android+mobile+2017PDF 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_off00011ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF6 11324 bytes
SHA-256: 759ee734b571022a8067d2551d67e6fa5f793285ed241119aa684059b07b4ade
font_01_sfnt_off0001394f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394F 19896 bytes
SHA-256: 36627357108eee33733aa1f9c6a0435499967ce187f135d7d163c7ad036ea082
font_02_sfnt_off00016e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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