Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa55cdd80540d52…

MALICIOUS

PDF

73.8 KB Created: 2021-09-16 09:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb7a3119529ee3ac926b0630bff8b426 SHA-1: 92413918d273f49091fbc574e922a3fefa8e6402 SHA-256: 1fa55cdd80540d522d2c87651dfd6df77f402e82f7602a41fbb7d4c1433e8fb0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing or redirection campaign, indicated by the presence of numerous external URIs and a link farm structure. The embedded JavaScript stream and the detection by ClamAV as 'Pdf.Phishing.Trojan' strongly suggest malicious intent. The sample leverages compromised CMS uploads and disposable hosting to obscure the ultimate destination, likely aiming to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://cructi.ru/uplcv?utm_term=best+loadout+for+the+mp5 PDF link annotation
    • http://podwierzba.eu/ckfinder/userfiles/files/vozafepilopopefamakos.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134d4fa28851---62438387871.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/47911293720.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/muvuxubogimarup.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/42366066142.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/84309889376.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/nukaradefesibifu.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/bcefa29d869c66aa4eaf0bc3f6400b94/wedokipivuwimebuvakozijav.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/49116216374.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/98641677817.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/17856641091.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/69020330583.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135a10816b0f---bofuso.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/61383767922.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f965d8d4ac---puwaferelim.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/rugujemepazolusidufap.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/d079367f4bf62c26437c7219d46c9ef1/puzuzofiwex.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/gagosoxuboliga.pdfIn PDF document text
    • https://phukienbep.net/media/files/82920949111.pdfIn PDF document text
    • https://dhesient.com/media/xojakodosotisoguwe.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210903_213827_9641.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/minuvoroxitejerowusibefed.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/6018948977.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/2557712569.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_off0000bd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD49 16588 bytes
SHA-256: 74375ff6fc54d4cd3b9ca513f61467a00f23e1fbe9783fff6d27a7e7bb031727
font_01_sfnt_off0000e83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10056 10852 bytes
SHA-256: be1ed563659811aa4267ce4a6a1c27caea563b6de362ebcdca8a490d52699ca0

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