Malicious PDF — malware analysis report

Static analysis result for SHA-256 be560f737766cc53…

MALICIOUS

PDF

72.5 KB Created: 2021-09-26 02:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc67b87d29efd9706ffe1e3d1810cbbd SHA-1: 084c96fa3f1da496dafb6e011891b3bdc3990ee2 SHA-256: be560f737766cc53186d2611bd986a0090733ac25a26146884576ac986a4c0b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • 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.
  • 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=how+to+recover+contacts+saved+in+phone+memory PDF link annotation
    • http://dnt-mayak.ru/content/File/gozovuvovetojopasifepej.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/1barudihrek7ugjjaqu2r2tji1/sufixedikilesovaj.pdfIn PDF document text
    • http://freeorden.com/media/file/dixobuxejulirodalutewa.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/5524956491.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/dovelozofepagupepasipe.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/libovedemef.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/28449960819.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dogogefina.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/542cfcdda6a5413947412c1e2919c310/67408584953.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/lokadoporovajolaseberu.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/27335666149.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/gililatup.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/035fd2ee84fa701365deeb3bd851f87f/97107815770.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/27400030172.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/gajazifipefuwaxiranupuxi.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/xepunanotito.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/75073718106.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109031030546366.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021911_25634_101.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/baxawozubewaborij.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/39103251845.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/96g72olcflno2f7467ufd571j7/fupegok.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/pebadujejik.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138829e80ec8---7759911226.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/59955377527.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210912212607.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_off0000b663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB663 17360 bytes
SHA-256: 50172c25738bd0e9d18babd90d9fee82a15b83b514550b51ded790398463eed1
font_01_sfnt_off0000e2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 10988 bytes
SHA-256: 01b736aab9044b79814b358b328b7a646b57bc6e01b57695c4b087762648ca43

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